SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of February 2021

Commission File Number 1-14926

KT Corporation

(Translation of registrant’s name into English)

90, Buljeong-ro,

Bundang-gu, Seongnam-si,

Gyeonggi-do,

Korea

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F  ☒            Form 40-F  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ☐

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  ☐            No  ☒

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-             

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated: February 9, 2021
KT Corporation
By:	/s/ Seunghoon Chi
Name:	Seunghoon Chi
Title:	Vice President
By:	/s/ Ginah Yun
Name:	Ginah Yun
Title:	Director

KT 2020 Earnings ReleaseKT 2020 Earnings Release

Disclaimer This presentation has been prepared by KT Corp.(the “Company”) in accordance with K-IFRS. This presentation contains forward-looking statements, which are subject to risks, uncertainties, and assumptions. This presentation is being presented solely for your information and is subject to change without notice. No presentation or warranty, expressed or implied, is made and no reliance should be placed on the accuracy, actuality, fairness, or completeness of the information presented. st The Company has applied new accounting standard of K-IFRS 1115 as of Jan 1 , 2018 and K-IFRS 1116 ‘Leases’ as of Jan st 1 , 2019. There are no obligation to apply the new standard to previous financial statements. The Company, its affiliates or representatives accept no liability whatsoever for any losses arising from any information contained in the presentation. This presentation does not constitute an offer or invitation to purchase or subscribe for any shares of the Company, and no part of this presentation shall form the Basis of or be relied upon in connection with any contract or commitment. Any decision to purchase shares of the Company could be made solely on the Basis of information, which has been publicly filed with the Securities and Exchange Commission or the Korea Stock Exchange and distributed to all investors. The contents of this presentation may not be reproduced, redistributed or passed on, directly or indirectly, to any other person or published, in whole or in part, for any purpose. If you have any related questions to this material, please contact IR department. Tel : +82-2-3495-3557, 3254, 3564, 5344 Fax : +82-2-3495-5917 2Disclaimer This presentation has been prepared by KT Corp.(the “Company”) in accordance with K-IFRS. This presentation contains forward-looking statements, which are subject to risks, uncertainties, and assumptions. This presentation is being presented solely for your information and is subject to change without notice. No presentation or warranty, expressed or implied, is made and no reliance should be placed on the accuracy, actuality, fairness, or completeness of the information presented. st The Company has applied new accounting standard of K-IFRS 1115 as of Jan 1 , 2018 and K-IFRS 1116 ‘Leases’ as of Jan st 1 , 2019. There are no obligation to apply the new standard to previous financial statements. The Company, its affiliates or representatives accept no liability whatsoever for any losses arising from any information contained in the presentation. This presentation does not constitute an offer or invitation to purchase or subscribe for any shares of the Company, and no part of this presentation shall form the Basis of or be relied upon in connection with any contract or commitment. Any decision to purchase shares of the Company could be made solely on the Basis of information, which has been publicly filed with the Securities and Exchange Commission or the Korea Stock Exchange and distributed to all investors. The contents of this presentation may not be reproduced, redistributed or passed on, directly or indirectly, to any other person or published, in whole or in part, for any purpose. If you have any related questions to this material, please contact IR department. Tel : +82-2-3495-3557, 3254, 3564, 5344 Fax : +82-2-3495-5917 2

2 Financial Highlights 3 Business Overview 4 Appendix 32 Financial Highlights 3 Business Overview 4 Appendix 3

1 2020 Highlights Earnings growth with expansion of growth business and profitability Financial improvement in core business (unit: KRW) Service Revenue Service Revenue (Consolidated) 20.8 tr. (YoY +0.4%) (KT separate) 15.1 tr. (YoY +1.0%) Operating Profit Operating Profit 1.18 tr. (YoY +2.1%) 0.88 tr. (YoY +17.4%) (Consolidated) (KT separate) Balanced growth in both Telco and Non-Telco businesses, Business Transforming business structure for future growth KT separate Group restructuring & Strategic investment Service revenue up over KRW 15tr. √ AI/DX grew 11.8% over year √ K bank capital increase √ IPTV grew 7.7% over year √ Hyundai HCN acquisition √ Mobile service grew 2.3%* over year √ KTH-KT mhows merger (*Adjusted Membership point accountings) Share buyback with strong confidence to improve corporate value & Shareholder 50% Payout ratio FY2020 Share KRW 1,350 (YoY +22.7%) KRW 300 bn. DPS Buyback 41 2020 Highlights Earnings growth with expansion of growth business and profitability Financial improvement in core business (unit: KRW) Service Revenue Service Revenue (Consolidated) 20.8 tr. (YoY +0.4%) (KT separate) 15.1 tr. (YoY +1.0%) Operating Profit Operating Profit 1.18 tr. (YoY +2.1%) 0.88 tr. (YoY +17.4%) (Consolidated) (KT separate) Balanced growth in both Telco and Non-Telco businesses, Business Transforming business structure for future growth KT separate Group restructuring & Strategic investment Service revenue up over KRW 15tr. √ AI/DX grew 11.8% over year √ K bank capital increase √ IPTV grew 7.7% over year √ Hyundai HCN acquisition √ Mobile service grew 2.3%* over year √ KTH-KT mhows merger (*Adjusted Membership point accountings) Share buyback with strong confidence to improve corporate value & Shareholder 50% Payout ratio FY2020 Share KRW 1,350 (YoY +22.7%) KRW 300 bn. DPS Buyback 4

2 2021 Management Plan The year of transforming into Digico(Digital Platform Company) from Telco Cash Cow B2B biz Platform biz Enhancing Profitability Growth Acceleration Establishing Growth Basis 1 DX Acceleration based on Restructuring group portfolio High value subs base expansion 2 ABC capabilities Efficient cost execution Nurturing platform business Focus on Digital New Deal capabilities 52 2021 Management Plan The year of transforming into Digico(Digital Platform Company) from Telco Cash Cow B2B biz Platform biz Enhancing Profitability Growth Acceleration Establishing Growth Basis 1 DX Acceleration based on Restructuring group portfolio High value subs base expansion 2 ABC capabilities Efficient cost execution Nurturing platform business Focus on Digital New Deal capabilities 5

3 2021 Guidance Focusing on service revenue growth via transforming into ‘Digico’ (Unit: KRW tr) (Unit: KRW tr) 25 +α 4% growth 24.3 15.1 23.9 14.9 2019 2020 2019 2020 2021(E) 2021(E) 63 2021 Guidance Focusing on service revenue growth via transforming into ‘Digico’ (Unit: KRW tr) (Unit: KRW tr) 25 +α 4% growth 24.3 15.1 23.9 14.9 2019 2020 2019 2020 2021(E) 2021(E) 6

1 KT Change Story 2 Financial Highlights 3 Business Overview 4 Appendix 71 KT Change Story 2 Financial Highlights 3 Business Overview 4 Appendix 7

K-IFRS / Consolidated 1 Income Statement • Service revenue increased YoY, whereas total revenue down -1.7% YoY due to decrease in Handset sales and Finance/Real estate revenues • Total Operating income up +2.1% YoY with efficient cost spending (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Operating Revenue 6,195.5 6,001.2 6,207.3 3.4% 0.2% 24,342.0 23,916.7 -1.7% Service Revenue 5,289.8 5,240.0 5,302.5 1.2% 0.2% 20,770.0 20,846.1 0.4% Handset Revenue 905.7 761.2 904.7 18.9% -0.1% 3,572.0 3,070.5 -14.0% Operating Expense 6,038.7 5,708.8 6,040.5 5.8% 0.0% 23,182.5 22,732.6 -1.9% Operating Income 156.7 292.4 166.8 -42.9% 6.4% 1,159.5 1,184.1 2.1% Margin 2.5% 4.9% 2.7% -2.2%p 0.2%p 4.8% 5.0% 0.2%p Margin* 3.0% 5.6% 3.1% -2.5%p 0.1%p 5.6% 5.7% 0.1%p Deficit Deficit Non-op. Income/Loss -132.0 22.0 -181.1 Turn Red -183.3 -209.0 Increased Increased Income before taxes 24.7 314.3 -14.3 Turn Red Turn Red 976.2 975.1 -0.1% Net Income -10.2 230.1 39.1 -83.0% Turn Black 665.9 703.4 5.6% Margin -0.2% 3.8% 0.6% -3.2%p 0.8%p 2.7% 2.9% 0.2%p EBITDA 1,078.4 1,197.1 1,072.8 -10.4% -0.5% 4,789.1 4,818.4 0.6% Margin 17.4% 19.9% 17.3% -2.6%p -0.1%p 19.7% 20.1% 0.4%p 8 ※ OP Margin* = Operating Income/Service RevenueK-IFRS / Consolidated 1 Income Statement • Service revenue increased YoY, whereas total revenue down -1.7% YoY due to decrease in Handset sales and Finance/Real estate revenues • Total Operating income up +2.1% YoY with efficient cost spending (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Operating Revenue 6,195.5 6,001.2 6,207.3 3.4% 0.2% 24,342.0 23,916.7 -1.7% Service Revenue 5,289.8 5,240.0 5,302.5 1.2% 0.2% 20,770.0 20,846.1 0.4% Handset Revenue 905.7 761.2 904.7 18.9% -0.1% 3,572.0 3,070.5 -14.0% Operating Expense 6,038.7 5,708.8 6,040.5 5.8% 0.0% 23,182.5 22,732.6 -1.9% Operating Income 156.7 292.4 166.8 -42.9% 6.4% 1,159.5 1,184.1 2.1% Margin 2.5% 4.9% 2.7% -2.2%p 0.2%p 4.8% 5.0% 0.2%p Margin* 3.0% 5.6% 3.1% -2.5%p 0.1%p 5.6% 5.7% 0.1%p Deficit Deficit Non-op. Income/Loss -132.0 22.0 -181.1 Turn Red -183.3 -209.0 Increased Increased Income before taxes 24.7 314.3 -14.3 Turn Red Turn Red 976.2 975.1 -0.1% Net Income -10.2 230.1 39.1 -83.0% Turn Black 665.9 703.4 5.6% Margin -0.2% 3.8% 0.6% -3.2%p 0.8%p 2.7% 2.9% 0.2%p EBITDA 1,078.4 1,197.1 1,072.8 -10.4% -0.5% 4,789.1 4,818.4 0.6% Margin 17.4% 19.9% 17.3% -2.6%p -0.1%p 19.7% 20.1% 0.4%p 8 ※ OP Margin* = Operating Income/Service Revenue

K-IFRS / Consolidated 2 Operating Expenses (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Operating Expenses 6,038.7 5,708.8 6,040.5 5.8% 0.0% 23,182.5 22,732.6 -1.9% Labor Cost 1,001.8 1,082.3 1,053.8 -2.6% 5.2% 3,951.1 4,123.7 4.4% General Expense 2,571.2 2,386.9 2,435.4 2.0% -5.3% 9,791.1 9,425.1 -3.7% - Depreciation 921.6 904.8 906.0 0.1% -1.7% 3,629.5 3,634.3 0.1% Cost of Service Provided 798.9 823.9 860.6 4.5% 7.7% 2,955.3 3,276.7 10.9% Selling Expense 499.5 614.3 682.6 11.1% 36.6% 2,277.9 2,435.8 6.9% Cost of Handset sold 1,167.3 801.4 1,008.1 25.8% -13.6% 4,207.1 3,471.2 -17.5% § Selling Expense (KT Separate) (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Selling Expense 566.0 641.9 686.3 6.9% 21.3% 2,379.6 2,523.0 6.0% 9K-IFRS / Consolidated 2 Operating Expenses (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Operating Expenses 6,038.7 5,708.8 6,040.5 5.8% 0.0% 23,182.5 22,732.6 -1.9% Labor Cost 1,001.8 1,082.3 1,053.8 -2.6% 5.2% 3,951.1 4,123.7 4.4% General Expense 2,571.2 2,386.9 2,435.4 2.0% -5.3% 9,791.1 9,425.1 -3.7% - Depreciation 921.6 904.8 906.0 0.1% -1.7% 3,629.5 3,634.3 0.1% Cost of Service Provided 798.9 823.9 860.6 4.5% 7.7% 2,955.3 3,276.7 10.9% Selling Expense 499.5 614.3 682.6 11.1% 36.6% 2,277.9 2,435.8 6.9% Cost of Handset sold 1,167.3 801.4 1,008.1 25.8% -13.6% 4,207.1 3,471.2 -17.5% § Selling Expense (KT Separate) (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Selling Expense 566.0 641.9 686.3 6.9% 21.3% 2,379.6 2,523.0 6.0% 9

K-IFRS / Consolidated 3 Financial Position (Unit: KRW bn) 4Q 19 3Q 20 4Q 20 QoQ YoY Assets 34,540.1 35,860.5 33,662.3 -6.1% -2.5% Cash & Cash Equivalents 2,305.9 2,990.9 2,634.6 -11.9% 14.3% Liabilities 19,356.6 20,204.0 18,110.9 -10.4% -6.4% Borrowings 7,298.9 7,850.9 7,316.1 -6.8% 0.2% Equity 15,183.5 15,656.5 15,551.4 -0.7% 2.4% Capital Stock 1,564.5 1,564.5 1,564.5 0.0% 0.0% Net Debt 4,993.0 4,860.0 4,681.5 -3.7% -6.2% Debt / Equity 127.5% 129.0% 116.5% -12.5%p -11.0%p Net Debt / Equity 32.9% 31.0% 30.1% -0.9%p -2.8%p 129.0% 127.5% 125.6% 123.1% 121.0% 121.2% 116.5% 116.5% Debt/Equity Net Debt/Equity 37.6% 32.9% 32.8% 31.0% 30.1% 28.1% 27.3% 26.7% 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 10K-IFRS / Consolidated 3 Financial Position (Unit: KRW bn) 4Q 19 3Q 20 4Q 20 QoQ YoY Assets 34,540.1 35,860.5 33,662.3 -6.1% -2.5% Cash & Cash Equivalents 2,305.9 2,990.9 2,634.6 -11.9% 14.3% Liabilities 19,356.6 20,204.0 18,110.9 -10.4% -6.4% Borrowings 7,298.9 7,850.9 7,316.1 -6.8% 0.2% Equity 15,183.5 15,656.5 15,551.4 -0.7% 2.4% Capital Stock 1,564.5 1,564.5 1,564.5 0.0% 0.0% Net Debt 4,993.0 4,860.0 4,681.5 -3.7% -6.2% Debt / Equity 127.5% 129.0% 116.5% -12.5%p -11.0%p Net Debt / Equity 32.9% 31.0% 30.1% -0.9%p -2.8%p 129.0% 127.5% 125.6% 123.1% 121.0% 121.2% 116.5% 116.5% Debt/Equity Net Debt/Equity 37.6% 32.9% 32.8% 31.0% 30.1% 28.1% 27.3% 26.7% 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 10

K-IFRS / Separate 4 CAPEX • CAPEX total 2.87 trillion won executed in 2020 - Access Network 1,592.6bn, Backbone Network 531.8bn, B2B communications 418.7bn, others 328.9bn (Unit: KRW bn) Access Network Backbone Network 3,711 B2B Others 3,313 3,257 2,872 2,514 2,397 2,359 2,475 2,250 1,870 1,977 2,199 1,593 1,362 1,133 1,316 1,196 1,035 466 532 476 452 428 241 408 492 497 448 261 419 394 517 367 362 298 736 305 499 330 329 258 259 284 227 189 2012 2013 2014 2015 2016 2017 2018 2019 2020 11K-IFRS / Separate 4 CAPEX • CAPEX total 2.87 trillion won executed in 2020 - Access Network 1,592.6bn, Backbone Network 531.8bn, B2B communications 418.7bn, others 328.9bn (Unit: KRW bn) Access Network Backbone Network 3,711 B2B Others 3,313 3,257 2,872 2,514 2,397 2,359 2,475 2,250 1,870 1,977 2,199 1,593 1,362 1,133 1,316 1,196 1,035 466 532 476 452 428 241 408 492 497 448 261 419 394 517 367 362 298 736 305 499 330 329 258 259 284 227 189 2012 2013 2014 2015 2016 2017 2018 2019 2020 11

1 KT Change Story 2 Financial Highlights 3 Business Overview 4 Appendix 121 KT Change Story 2 Financial Highlights 3 Business Overview 4 Appendix 12

K-IFRS / Separate 1 KT - Wireless ∙ Wireless service revenue up +1.6% YoY with 5G subscribers growth ∙ Total number of 5G subscribers recorded 3.62 million(25% of Handset subscribers) (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Wireless 1,705.4 1,742.1 1,733.4 -0.5% 1.6% 6,847.1 6,933.8 1.3% Service 1,607.1 1,636.2 1,658.5 1.4% 3.2% 6,442.7 6,542.7 1.6% Interconnection 98.3 105.9 74.9 -29.3% -23.8% 404.4 391.1 -3.3% 22,333 22,305 22,133 21,922 21,976 21,771 21,549 21,333 419 1,055 1,419 1,778 2,237 2,812 Subscribers 3,617 (Unit: Thousands) 5G 14,090 14,124 14,165 14,231 14,291 14,324 14,049 14,335 Handset (5G incl.) (5G incl.) (5G incl.) (5G incl.) (5G incl.) (5G incl.) (5G incl.) 2nd Device/IoT MVNO 3,054 3,985 4,517 3,691 3,856 4,100 4,325 3,529 4,917 3,768 3,792 3,772 3,755 3,645 3,517 3,492 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 13K-IFRS / Separate 1 KT - Wireless ∙ Wireless service revenue up +1.6% YoY with 5G subscribers growth ∙ Total number of 5G subscribers recorded 3.62 million(25% of Handset subscribers) (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Wireless 1,705.4 1,742.1 1,733.4 -0.5% 1.6% 6,847.1 6,933.8 1.3% Service 1,607.1 1,636.2 1,658.5 1.4% 3.2% 6,442.7 6,542.7 1.6% Interconnection 98.3 105.9 74.9 -29.3% -23.8% 404.4 391.1 -3.3% 22,333 22,305 22,133 21,922 21,976 21,771 21,549 21,333 419 1,055 1,419 1,778 2,237 2,812 Subscribers 3,617 (Unit: Thousands) 5G 14,090 14,124 14,165 14,231 14,291 14,324 14,049 14,335 Handset (5G incl.) (5G incl.) (5G incl.) (5G incl.) (5G incl.) (5G incl.) (5G incl.) 2nd Device/IoT MVNO 3,054 3,985 4,517 3,691 3,856 4,100 4,325 3,529 4,917 3,768 3,792 3,772 3,755 3,645 3,517 3,492 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 13

K-IFRS / Separate 2 KT – Fixed Line/IPTV ∙ Telephony revenue down -7.3% YoY and Broadband revenue maintained last year’s level despite interconnection rates decrease ∙ IPTV revenue up +7.7% YoY with consistent subs growth and platform revenue growth (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Telephony 382.5 369.2 351.5 -4.8% -8.1% 1,580.5 1,465.5 -7.3% Broadband 498.8 498.7 503.3 0.9% 0.9% 2,002.1 2,001.2 0.0% IPTV 410.2 459.3 438.6 -4.5% 6.9% 1,599.5 1,723.2 7.7% Broadband Subscriber IPTV Subscriber (Unit: Thousands) (Unit: Thousands) 9,171 9,130 8,763 9,043 8,687 8,962 8,962 8,904 8,849 8,559 8,782 8,422 8,351 8,229 8,113 7,966 64.1% 63.4% 62.9% 62.1% 61.0% 60.1% 59.0% 57.6% 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 Subscribers % of GiGA ※ Number of IPTV subscribers above deviates from MSIT’s released figure below following IPTV law - Number of KT pay TV subscriber is 7,588,574 in 1H 2020 (6 month average) 14K-IFRS / Separate 2 KT – Fixed Line/IPTV ∙ Telephony revenue down -7.3% YoY and Broadband revenue maintained last year’s level despite interconnection rates decrease ∙ IPTV revenue up +7.7% YoY with consistent subs growth and platform revenue growth (Unit: KRW bn) 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY Telephony 382.5 369.2 351.5 -4.8% -8.1% 1,580.5 1,465.5 -7.3% Broadband 498.8 498.7 503.3 0.9% 0.9% 2,002.1 2,001.2 0.0% IPTV 410.2 459.3 438.6 -4.5% 6.9% 1,599.5 1,723.2 7.7% Broadband Subscriber IPTV Subscriber (Unit: Thousands) (Unit: Thousands) 9,171 9,130 8,763 9,043 8,687 8,962 8,962 8,904 8,849 8,559 8,782 8,422 8,351 8,229 8,113 7,966 64.1% 63.4% 62.9% 62.1% 61.0% 60.1% 59.0% 57.6% 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 Subscribers % of GiGA ※ Number of IPTV subscribers above deviates from MSIT’s released figure below following IPTV law - Number of KT pay TV subscriber is 7,588,574 in 1H 2020 (6 month average) 14

K-IFRS / Separate 3 KT – B2B and others ∙ B2B revenue up +2.0% YoY with increasing demands in IDC business and Cloud business expansion (Unit: KRW bn) 2019 2020 YoY 4Q19 3Q20 4Q20 QoQ YoY 2,719.1 2,774.0 2.0% B2B 725.9 690.3 707.9 2.5% -2.5% 1,064.3 1,068.7 0.4% Corporate Fixed Line 268.9 266.9 266.8 0.0% -0.8% 1,162.1 1,154.7 -0.6% Corporate IT/Solution 316.2 288.7 302.1 4.6% -4.5% AI/DX 492.7 550.7 11.8% 140.8 134.7 138.9 3.1% -1.4% Real estate 45.6 45.4 50.8 12.0% 11.4% 182.7 185.2 1.4% Handset revenue 837.8 715.5 804.5 12.4% -4.0% 3,273.7 2,796.5 -14.6% CAGR +15.1% B2B business breakdown AI/DX revenue (Unit: KRW bn) 550.7 492.7 Corp. Lines Line lease, Kornet 404.0 361.1 Corp. SI, Global ICT, Energy, Video security, IT/Solution etc. IDC, Cloud, bizmeka, AI Platform, AI/DX Block chain, Smart mobility, etc. 2017 2018 2019 2020 15K-IFRS / Separate 3 KT – B2B and others ∙ B2B revenue up +2.0% YoY with increasing demands in IDC business and Cloud business expansion (Unit: KRW bn) 2019 2020 YoY 4Q19 3Q20 4Q20 QoQ YoY 2,719.1 2,774.0 2.0% B2B 725.9 690.3 707.9 2.5% -2.5% 1,064.3 1,068.7 0.4% Corporate Fixed Line 268.9 266.9 266.8 0.0% -0.8% 1,162.1 1,154.7 -0.6% Corporate IT/Solution 316.2 288.7 302.1 4.6% -4.5% AI/DX 492.7 550.7 11.8% 140.8 134.7 138.9 3.1% -1.4% Real estate 45.6 45.4 50.8 12.0% 11.4% 182.7 185.2 1.4% Handset revenue 837.8 715.5 804.5 12.4% -4.0% 3,273.7 2,796.5 -14.6% CAGR +15.1% B2B business breakdown AI/DX revenue (Unit: KRW bn) 550.7 492.7 Corp. Lines Line lease, Kornet 404.0 361.1 Corp. SI, Global ICT, Energy, Video security, IT/Solution etc. IDC, Cloud, bizmeka, AI Platform, AI/DX Block chain, Smart mobility, etc. 2017 2018 2019 2020 15

K-IFRS / consolidated(each subsidiary) 4 Major subsidiaries ∙ BC card and KT Estate revenues down -4.2% and -24.9% YoY, respectively, due to COVID-19 causing slump in credit cards and rental business ∙ Contents subsidiaries revenue up +9.6% YoY with volume growth in both music distribution and T-Commerce (Unit: KRW bn) Subsidiaries Revenue 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY BC card 921.4 863.4 856.4 -0.8% -7.1% 3,536.5 3,386.4 -4.2% Skylife 167.4 176.6 176.5 -0.1% 5.4% 694.6 698.7 0.6% Contents 189.1 194.0 218.1 12.4% 15.3% 704.2 772.0 9.6% subsidiaries 485.3 364.4 -24.9% KT estate 129.8 76.2 77.2 1.3% -40.6% ※ “Storywiz,” specialized in web fiction/web cartoon contents, included in Contents subsidiaries since 2Q 2020 ※ KT estate : Revenue decreased about KRW 46 bn due to transferring of FM(facility management) unit to KT Telecop in August 2020. OP contribution by subsidiaries in total (Unit: KRW bn) 114.7 105.6 97.1 94.4 89.1 85.6 83.5 47.7 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 16K-IFRS / consolidated(each subsidiary) 4 Major subsidiaries ∙ BC card and KT Estate revenues down -4.2% and -24.9% YoY, respectively, due to COVID-19 causing slump in credit cards and rental business ∙ Contents subsidiaries revenue up +9.6% YoY with volume growth in both music distribution and T-Commerce (Unit: KRW bn) Subsidiaries Revenue 4Q19 3Q20 4Q20 QoQ YoY 2019 2020 YoY BC card 921.4 863.4 856.4 -0.8% -7.1% 3,536.5 3,386.4 -4.2% Skylife 167.4 176.6 176.5 -0.1% 5.4% 694.6 698.7 0.6% Contents 189.1 194.0 218.1 12.4% 15.3% 704.2 772.0 9.6% subsidiaries 485.3 364.4 -24.9% KT estate 129.8 76.2 77.2 1.3% -40.6% ※ “Storywiz,” specialized in web fiction/web cartoon contents, included in Contents subsidiaries since 2Q 2020 ※ KT estate : Revenue decreased about KRW 46 bn due to transferring of FM(facility management) unit to KT Telecop in August 2020. OP contribution by subsidiaries in total (Unit: KRW bn) 114.7 105.6 97.1 94.4 89.1 85.6 83.5 47.7 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 16

1 KT Change Story 2 Financial Highlights 3 Business Overview 4 Appendix 171 KT Change Story 2 Financial Highlights 3 Business Overview 4 Appendix 17

1 K-IFRS Income Statement (Unit: KRW bn) Consolidated 1Q 19 2Q 19 3Q 19 4Q 19 2019 1Q 20 2Q 20 3Q 20 4Q 20 2020 KT Separate 1Q 19 2Q 19 3Q 19 4Q 19 2019 1Q 20 2Q 20 3Q 20 4Q 20 2020 Operating revenue 5,834.4 6,098.5 6,213.7 6,195.5 24,342.0 5,831.7 5,876.5 6,001.2 6,207.3 23,916.7 Operating revenue 4,334.3 4,558.5 4,705.7 4,606.2 18,204.7 4,429.1 4,339.6 4,520.5 4,590.0 17,879.2 Service revenue 5,055.5 5,225.2 5,199.6 5,289.8 20,770.0 5,107.0 5,196.6 5,240.0 5,302.5 20,846.1 Service revenue 3,645.4 3,751.3 3,765.9 3,768.5 14,931.0 3,749.0 3,743.2 3,805.0 3,785.5 15,082.8 Handset revenue 778.9 873.3 1,014.1 905.7 3,572.0 724.7 679.9 761.2 904.7 3,070.5 Handset revenue 688.9 807.3 939.8 837.8 3,273.7 680.1 596.4 715.5 804.5 2,796.5 Operating expense 5,432.3 5,810.3 5,901.2 6,038.7 23,182.5 5,448.6 5,534.7 5,708.8 6,040.5 22,732.6 Operating expense 4,037.8 4,367.4 4,508.0 4,543.8 17,457.0 4,129.5 4,086.9 4,313.7 4,470.9 17,001.0 Service expense 4,568.7 4,791.0 4,744.3 4,871.4 18,975.4 4,574.2 4,747.4 4,907.4 5,032.4 19,261.4 Service expense 3,325.3 3,493.6 3,504.9 3,543.2 13,867.0 3,368.7 3,444.5 3,571.2 3,605.2 13,989.7 983.8 1,006.1 959.4 1,001.8 3,951.1 1,003.9 983.7 1,082.3 1,053.8 4,123.7 543.6 573.7 528.5 537.5 2,183.2 555.1 535.4 629.2 548.1 2,267.8 Labor cost Labor cost 2,327.1 2,459.3 2,433.5 2,571.2 9,791.1 2,259.5 2,343.3 2,386.9 2,435.4 9,425.1 1,595.7 1,671.8 1,690.7 1,791.8 6,749.9 1,613.2 1,656.0 1,692.1 1,756.3 6,717.7 General expense General expense Cost of svc provided 685.6 711.7 759.1 798.9 2,955.3 759.2 833.0 823.9 860.6 3,276.7 Cost of svc provided 588.1 618.4 649.0 688.2 2,543.6 609.0 617.6 592.6 592.9 2,412.1 Selling expense 572.2 613.9 592.3 499.5 2,277.9 551.6 587.4 614.3 682.6 2,435.8 Selling expense 598.0 629.7 636.7 525.7 2,390.2 591.4 635.5 657.3 707.9 2,592.1 Cost of device sold 863.6 1,019.3 1,156.9 1,167.3 4,207.1 874.4 787.3 801.4 1,008.1 3,471.2 Cost of device sold 712.5 873.8 1,003.1 1,000.6 3,590.1 760.8 642.4 742.5 865.7 3,011.5 Operating income 402.1 288.2 312.5 156.7 1,159.5 383.1 341.8 292.4 166.8 1,184.1 Operating income 296.4 191.1 197.7 62.4 747.7 299.6 252.7 206.8 119.1 878.2 N-OP income (loss) -4.4 -4.7 -42.2 -132.0 -183.3 -15.9 -34.0 22.0 -181.1 -209.0 N-OP income (loss) 100.7 -1.8 -99.5 -124.0 -124.5 134.2 -28.0 14.5 -185.6 -64.9 N-OP income 181.5 199.2 208.4 94.7 683.8 290.5 85.3 157.5 306.5 839.9 N-OP income 271.7 179.4 195.2 60.1 706.4 389.0 82.2 95.3 282.7 849.2 N-OP expense 186.5 199.1 252.3 225.9 863.8 302.9 114.5 140.4 509.1 1,067.0 N-OP expense 170.9 181.2 294.7 184.1 830.9 254.8 110.2 80.8 468.4 914.1 Equity Method (G/L) 0.7 -4.8 1.7 -0.9 -3.3 -3.5 -4.8 4.9 21.5 18.0 Income bf tax 397.7 283.5 270.3 24.7 976.2 367.2 307.9 314.3 -14.3 975.1 Income bf tax 397.2 189.4 98.2 -61.5 623.2 433.8 224.7 221.3 - 66.5 813.3 Income tax 138.0 80.5 57.0 34.9 310.3 140.6 100.3 84.2 -53.4 271.7 Income tax 104.5 49.7 25.8 14.8 194.8 113.8 58.9 58.1 - 83.0 147.8 Net income 259.8 203.0 213.3 -10.2 665.9 226.6 207.6 230.1 39.1 703.4 Net income 292.6 139.7 72.4 -76.3 428.4 320.0 165.8 163.2 16.5 665.5 NI contribution to KT 231.1 173.9 189.7 21.0 615.8 208.3 176.6 203.4 69.7 658.0 1,309.5 1,191.3 1,209.8 1,078.4 4,789.1 1,295.8 1,252.6 1,197.1 1,072.8 4,818.4 1,108.1 997.7 999.3 871.7 3,976.9 1,113.5 1,063.3 1,010.0 925.3 4,112.1 EBITDA EBITDA EBITDA Margin 22.4% 19.5% 19.5% 17.4% 19.7% 22.2% 21.3% 19.9% 17.3% 20.1% 25.6% 21.9% 21.2% 18.9% 21.8% 25.1% 24.5% 22.3% 20.2% 23.0% EBITDA Margin 181 K-IFRS Income Statement (Unit: KRW bn) Consolidated 1Q 19 2Q 19 3Q 19 4Q 19 2019 1Q 20 2Q 20 3Q 20 4Q 20 2020 KT Separate 1Q 19 2Q 19 3Q 19 4Q 19 2019 1Q 20 2Q 20 3Q 20 4Q 20 2020 Operating revenue 5,834.4 6,098.5 6,213.7 6,195.5 24,342.0 5,831.7 5,876.5 6,001.2 6,207.3 23,916.7 Operating revenue 4,334.3 4,558.5 4,705.7 4,606.2 18,204.7 4,429.1 4,339.6 4,520.5 4,590.0 17,879.2 Service revenue 5,055.5 5,225.2 5,199.6 5,289.8 20,770.0 5,107.0 5,196.6 5,240.0 5,302.5 20,846.1 Service revenue 3,645.4 3,751.3 3,765.9 3,768.5 14,931.0 3,749.0 3,743.2 3,805.0 3,785.5 15,082.8 Handset revenue 778.9 873.3 1,014.1 905.7 3,572.0 724.7 679.9 761.2 904.7 3,070.5 Handset revenue 688.9 807.3 939.8 837.8 3,273.7 680.1 596.4 715.5 804.5 2,796.5 Operating expense 5,432.3 5,810.3 5,901.2 6,038.7 23,182.5 5,448.6 5,534.7 5,708.8 6,040.5 22,732.6 Operating expense 4,037.8 4,367.4 4,508.0 4,543.8 17,457.0 4,129.5 4,086.9 4,313.7 4,470.9 17,001.0 Service expense 4,568.7 4,791.0 4,744.3 4,871.4 18,975.4 4,574.2 4,747.4 4,907.4 5,032.4 19,261.4 Service expense 3,325.3 3,493.6 3,504.9 3,543.2 13,867.0 3,368.7 3,444.5 3,571.2 3,605.2 13,989.7 983.8 1,006.1 959.4 1,001.8 3,951.1 1,003.9 983.7 1,082.3 1,053.8 4,123.7 543.6 573.7 528.5 537.5 2,183.2 555.1 535.4 629.2 548.1 2,267.8 Labor cost Labor cost 2,327.1 2,459.3 2,433.5 2,571.2 9,791.1 2,259.5 2,343.3 2,386.9 2,435.4 9,425.1 1,595.7 1,671.8 1,690.7 1,791.8 6,749.9 1,613.2 1,656.0 1,692.1 1,756.3 6,717.7 General expense General expense Cost of svc provided 685.6 711.7 759.1 798.9 2,955.3 759.2 833.0 823.9 860.6 3,276.7 Cost of svc provided 588.1 618.4 649.0 688.2 2,543.6 609.0 617.6 592.6 592.9 2,412.1 Selling expense 572.2 613.9 592.3 499.5 2,277.9 551.6 587.4 614.3 682.6 2,435.8 Selling expense 598.0 629.7 636.7 525.7 2,390.2 591.4 635.5 657.3 707.9 2,592.1 Cost of device sold 863.6 1,019.3 1,156.9 1,167.3 4,207.1 874.4 787.3 801.4 1,008.1 3,471.2 Cost of device sold 712.5 873.8 1,003.1 1,000.6 3,590.1 760.8 642.4 742.5 865.7 3,011.5 Operating income 402.1 288.2 312.5 156.7 1,159.5 383.1 341.8 292.4 166.8 1,184.1 Operating income 296.4 191.1 197.7 62.4 747.7 299.6 252.7 206.8 119.1 878.2 N-OP income (loss) -4.4 -4.7 -42.2 -132.0 -183.3 -15.9 -34.0 22.0 -181.1 -209.0 N-OP income (loss) 100.7 -1.8 -99.5 -124.0 -124.5 134.2 -28.0 14.5 -185.6 -64.9 N-OP income 181.5 199.2 208.4 94.7 683.8 290.5 85.3 157.5 306.5 839.9 N-OP income 271.7 179.4 195.2 60.1 706.4 389.0 82.2 95.3 282.7 849.2 N-OP expense 186.5 199.1 252.3 225.9 863.8 302.9 114.5 140.4 509.1 1,067.0 N-OP expense 170.9 181.2 294.7 184.1 830.9 254.8 110.2 80.8 468.4 914.1 Equity Method (G/L) 0.7 -4.8 1.7 -0.9 -3.3 -3.5 -4.8 4.9 21.5 18.0 Income bf tax 397.7 283.5 270.3 24.7 976.2 367.2 307.9 314.3 -14.3 975.1 Income bf tax 397.2 189.4 98.2 -61.5 623.2 433.8 224.7 221.3 - 66.5 813.3 Income tax 138.0 80.5 57.0 34.9 310.3 140.6 100.3 84.2 -53.4 271.7 Income tax 104.5 49.7 25.8 14.8 194.8 113.8 58.9 58.1 - 83.0 147.8 Net income 259.8 203.0 213.3 -10.2 665.9 226.6 207.6 230.1 39.1 703.4 Net income 292.6 139.7 72.4 -76.3 428.4 320.0 165.8 163.2 16.5 665.5 NI contribution to KT 231.1 173.9 189.7 21.0 615.8 208.3 176.6 203.4 69.7 658.0 1,309.5 1,191.3 1,209.8 1,078.4 4,789.1 1,295.8 1,252.6 1,197.1 1,072.8 4,818.4 1,108.1 997.7 999.3 871.7 3,976.9 1,113.5 1,063.3 1,010.0 925.3 4,112.1 EBITDA EBITDA EBITDA Margin 22.4% 19.5% 19.5% 17.4% 19.7% 22.2% 21.3% 19.9% 17.3% 20.1% 25.6% 21.9% 21.2% 18.9% 21.8% 25.1% 24.5% 22.3% 20.2% 23.0% EBITDA Margin 18

2 K-IFRS Balance Sheet (Unit: KRW bn) Consolidated 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 KT Separate 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 Assets 33,247.8 33,469.4 33,661.3 34,540.1 32,631.0 34,003.4 35,860.5 33,662.3 Assets 26,837.7 26,959.8 27,076.4 28,212.7 27,069.1 27,578.0 28,185.5 28,027.9 12,396.1 11,818.3 11,716.7 12,020.3 10,887.2 12,480.5 14,215.2 11,154.2 7,307.3 7,052.4 6,961.4 7,235.2 6,884.5 7,451.4 8,102.4 7,155.7 Current assets Current assets 2,765.0 2,250.1 2,128.4 2,305.9 1,627.1 2,942.2 2,990.9 2,634.6 1,750.1 1,394.9 1,189.2 1,328.4 754.1 1,422.1 1,911.6 1,541.2 Cash & cash equi. Cash & cash equi. 4,129.5 4,364.8 4,108.2 4,177.6 4,121.3 4,159.9 4,272.5 3,840.2 3,357.8 3,451.0 3,300.9 3,231.0 3,490.2 3,372.7 3,473.7 3,127.0 Trade & other rec Trade & other rec Inventories 646.4 607.6 636.2 665.5 634.7 640.6 851.9 534.6 Inventories 446.4 404.8 437.6 477.1 439.4 459.5 649.4 353.3 Other current asset 4,855.2 4,595.7 4,843.9 4,871.2 4,504.1 4,737.8 6,099.9 4,144.7 Other current asset 1,753.1 1,801.7 2,033.7 2,198.7 2,200.8 2,197.1 2,067.7 2,134.2 -Prepaid_Contract cost 1,106.3 1,165.2 1,318.5 1,389.5 1,362.5 1,378.4 1,379.9 1,345.7 -Prepaid_Contract cost 1,134.5 1,210.6 1,368.1 1,432.1 1,408.2 1,431.6 1,432.8 1,406.9 -Contract assets 330.9 377.8 430.6 409.8 393.7 391.2 382.9 392.3 -Contract assets 300.2 339.1 384.4 382.2 359.2 349.7 338.2 343.4 20,851.8 21,651.1 21,944.6 22,519.8 21,743.8 21,522.9 21,645.3 22,508.2 19,530.4 19,907.4 20,115.0 20,977.4 20,184.6 20,126.6 20,083.1 20,872.2 Non-current assets Non-current assets Trade & other rec 690.4 867.9 943.6 991.9 996.7 1,123.4 1,060.6 1,128.3 Trade & other rec 641.7 806.4 888.0 1,063.4 954.4 1,063.8 1,001.3 1,080.3 Tangible assets 12,811.1 13,192.8 13,349.7 13,785.3 13,497.4 13,454.5 13,773.5 14,206.1 Tangible assets 10,656.7 10,914.5 11,092.4 11,448.0 11,284.6 11,250.6 11,502.2 11,999.7 Other current assets 7,350.3 7,590.4 7,651.3 7,742.6 7,249.7 6,945.0 6,811.2 7,173.7 Other current assets 8,232.0 8,186.5 8,134.5 8,466.0 7,945.6 7,812.2 7,579.6 7,792.2 -Prepaid_Contract cost 364.4 403.5 460.3 459.8 461.3 456.9 466.4 458.2 -Prepaid_Contract cost 351.4 398.9 457.0 444.2 448.8 446.0 454.7 454.8 -Contract assets 94.1 111.3 126.5 147.3 147.2 161.6 176.5 194.2 -Contract assets 84.0 101.4 112.5 95.8 93.6 98.6 106.5 118.8 18,509.4 18,464.8 18,430.1 19,356.6 17,559.4 18,629.6 20,204.0 18,110.9 14,099.7 14,076.5 14,122.0 15,319.4 14,133.3 14,466.5 14,877.7 14,824.4 Liabilities Liabilities Current liabilities 9,926.8 9,908.1 9,973.8 10,184.6 9,171.5 9,894.9 11,479.1 9,192.5 Current liabilities 6,283.8 6,238.7 6,471.1 6,801.3 6,486.4 6,562.1 6,980.9 6,608.0 Trade & other payables 7,264.0 7,980.9 7,709.7 7,597.5 6,524.1 6,601.7 8,255.6 6,210.1 Trade & other payables 4,472.4 5,118.4 5,006.4 5,062.3 4,560.1 4,130.9 4,613.6 4,568.4 Short-term borrowings 1,149.0 583.6 915.7 1,185.7 1,271.3 1,652.3 1,546.0 1,418.1 Short-term borrowings 948.5 380.4 744.7 1,052.5 1,168.5 1,539.3 1,381.4 1,228.8 Others 1,513.8 1,343.6 1,348.4 1,401.4 1,376.2 1,640.9 1,677.5 1,564.3 Others 862.9 739.9 720.0 686.5 757.8 891.9 985.9 810.8 302.9 304.4 304.1 313.6 314.6 315.5 316.3 327.1 302.1 306.7 304.2 314.5 316.7 316.0 319.7 316.8 - Contract liabilities - Contract liabilities 8,582.5 8,556.7 8,456.4 9,171.9 8,387.9 8,734.7 8,724.9 8,918.4 7,815.9 7,837.8 7,650.9 8,518.1 7,646.9 7,904.4 7,896.8 8,216.4 Non-current liabilities Non-current liabilities 1,132.7 1,110.0 1,125.6 1,082.2 801.7 811.1 810.0 807.5 1,524.9 1,476.1 1,454.2 1,817.1 1,061.2 1,051.7 996.8 1,512.9 Trade & other payables Trade & other payables 5,641.1 5,673.2 5,492.6 6,113.1 6,015.6 6,335.3 6,304.9 5,898.0 5,502.7 5,549.0 5,371.1 5,975.5 5,854.5 6,082.7 6,080.7 5,717.0 Long-term borrowings Long-term borrowings 1,808.7 1,773.5 1,838.2 1,976.5 1,570.6 1,588.3 1,610.0 2,212.9 788.3 812.6 825.6 725.5 731.2 770.0 819.3 986.5 Others Others 44.3 42.7 45.0 52.0 58.5 51.5 52.2 57.1 41.4 40.1 42.4 49.1 55.5 49.9 50.9 54.6 - Contract liabilities - Contract liabilities 14,738.5 15,004.6 15,231.1 15,183.5 15,071.6 15,373.8 15,656.5 15,551.4 12,738.0 12,883.3 12,954.3 12,893.3 12,935.8 13,111.5 13,307.8 13,203.5 Equity Equity Retained earnings 11,269.5 11,438.9 11,627.4 11,633.8 11,575.1 11,936.1 12,139.8 12,155.4 10,741.7 10,880.2 10,952.9 10,866.6 10,919.6 11,084.8 11,249.0 11,233.7 Retained earnings 192 K-IFRS Balance Sheet (Unit: KRW bn) Consolidated 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 KT Separate 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 Assets 33,247.8 33,469.4 33,661.3 34,540.1 32,631.0 34,003.4 35,860.5 33,662.3 Assets 26,837.7 26,959.8 27,076.4 28,212.7 27,069.1 27,578.0 28,185.5 28,027.9 12,396.1 11,818.3 11,716.7 12,020.3 10,887.2 12,480.5 14,215.2 11,154.2 7,307.3 7,052.4 6,961.4 7,235.2 6,884.5 7,451.4 8,102.4 7,155.7 Current assets Current assets 2,765.0 2,250.1 2,128.4 2,305.9 1,627.1 2,942.2 2,990.9 2,634.6 1,750.1 1,394.9 1,189.2 1,328.4 754.1 1,422.1 1,911.6 1,541.2 Cash & cash equi. Cash & cash equi. 4,129.5 4,364.8 4,108.2 4,177.6 4,121.3 4,159.9 4,272.5 3,840.2 3,357.8 3,451.0 3,300.9 3,231.0 3,490.2 3,372.7 3,473.7 3,127.0 Trade & other rec Trade & other rec Inventories 646.4 607.6 636.2 665.5 634.7 640.6 851.9 534.6 Inventories 446.4 404.8 437.6 477.1 439.4 459.5 649.4 353.3 Other current asset 4,855.2 4,595.7 4,843.9 4,871.2 4,504.1 4,737.8 6,099.9 4,144.7 Other current asset 1,753.1 1,801.7 2,033.7 2,198.7 2,200.8 2,197.1 2,067.7 2,134.2 -Prepaid_Contract cost 1,106.3 1,165.2 1,318.5 1,389.5 1,362.5 1,378.4 1,379.9 1,345.7 -Prepaid_Contract cost 1,134.5 1,210.6 1,368.1 1,432.1 1,408.2 1,431.6 1,432.8 1,406.9 -Contract assets 330.9 377.8 430.6 409.8 393.7 391.2 382.9 392.3 -Contract assets 300.2 339.1 384.4 382.2 359.2 349.7 338.2 343.4 20,851.8 21,651.1 21,944.6 22,519.8 21,743.8 21,522.9 21,645.3 22,508.2 19,530.4 19,907.4 20,115.0 20,977.4 20,184.6 20,126.6 20,083.1 20,872.2 Non-current assets Non-current assets Trade & other rec 690.4 867.9 943.6 991.9 996.7 1,123.4 1,060.6 1,128.3 Trade & other rec 641.7 806.4 888.0 1,063.4 954.4 1,063.8 1,001.3 1,080.3 Tangible assets 12,811.1 13,192.8 13,349.7 13,785.3 13,497.4 13,454.5 13,773.5 14,206.1 Tangible assets 10,656.7 10,914.5 11,092.4 11,448.0 11,284.6 11,250.6 11,502.2 11,999.7 Other current assets 7,350.3 7,590.4 7,651.3 7,742.6 7,249.7 6,945.0 6,811.2 7,173.7 Other current assets 8,232.0 8,186.5 8,134.5 8,466.0 7,945.6 7,812.2 7,579.6 7,792.2 -Prepaid_Contract cost 364.4 403.5 460.3 459.8 461.3 456.9 466.4 458.2 -Prepaid_Contract cost 351.4 398.9 457.0 444.2 448.8 446.0 454.7 454.8 -Contract assets 94.1 111.3 126.5 147.3 147.2 161.6 176.5 194.2 -Contract assets 84.0 101.4 112.5 95.8 93.6 98.6 106.5 118.8 18,509.4 18,464.8 18,430.1 19,356.6 17,559.4 18,629.6 20,204.0 18,110.9 14,099.7 14,076.5 14,122.0 15,319.4 14,133.3 14,466.5 14,877.7 14,824.4 Liabilities Liabilities Current liabilities 9,926.8 9,908.1 9,973.8 10,184.6 9,171.5 9,894.9 11,479.1 9,192.5 Current liabilities 6,283.8 6,238.7 6,471.1 6,801.3 6,486.4 6,562.1 6,980.9 6,608.0 Trade & other payables 7,264.0 7,980.9 7,709.7 7,597.5 6,524.1 6,601.7 8,255.6 6,210.1 Trade & other payables 4,472.4 5,118.4 5,006.4 5,062.3 4,560.1 4,130.9 4,613.6 4,568.4 Short-term borrowings 1,149.0 583.6 915.7 1,185.7 1,271.3 1,652.3 1,546.0 1,418.1 Short-term borrowings 948.5 380.4 744.7 1,052.5 1,168.5 1,539.3 1,381.4 1,228.8 Others 1,513.8 1,343.6 1,348.4 1,401.4 1,376.2 1,640.9 1,677.5 1,564.3 Others 862.9 739.9 720.0 686.5 757.8 891.9 985.9 810.8 302.9 304.4 304.1 313.6 314.6 315.5 316.3 327.1 302.1 306.7 304.2 314.5 316.7 316.0 319.7 316.8 - Contract liabilities - Contract liabilities 8,582.5 8,556.7 8,456.4 9,171.9 8,387.9 8,734.7 8,724.9 8,918.4 7,815.9 7,837.8 7,650.9 8,518.1 7,646.9 7,904.4 7,896.8 8,216.4 Non-current liabilities Non-current liabilities 1,132.7 1,110.0 1,125.6 1,082.2 801.7 811.1 810.0 807.5 1,524.9 1,476.1 1,454.2 1,817.1 1,061.2 1,051.7 996.8 1,512.9 Trade & other payables Trade & other payables 5,641.1 5,673.2 5,492.6 6,113.1 6,015.6 6,335.3 6,304.9 5,898.0 5,502.7 5,549.0 5,371.1 5,975.5 5,854.5 6,082.7 6,080.7 5,717.0 Long-term borrowings Long-term borrowings 1,808.7 1,773.5 1,838.2 1,976.5 1,570.6 1,588.3 1,610.0 2,212.9 788.3 812.6 825.6 725.5 731.2 770.0 819.3 986.5 Others Others 44.3 42.7 45.0 52.0 58.5 51.5 52.2 57.1 41.4 40.1 42.4 49.1 55.5 49.9 50.9 54.6 - Contract liabilities - Contract liabilities 14,738.5 15,004.6 15,231.1 15,183.5 15,071.6 15,373.8 15,656.5 15,551.4 12,738.0 12,883.3 12,954.3 12,893.3 12,935.8 13,111.5 13,307.8 13,203.5 Equity Equity Retained earnings 11,269.5 11,438.9 11,627.4 11,633.8 11,575.1 11,936.1 12,139.8 12,155.4 10,741.7 10,880.2 10,952.9 10,866.6 10,919.6 11,084.8 11,249.0 11,233.7 Retained earnings 19

K-IFRS / Separate 3 Subscribers Wireless 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 QoQ YoY 1) Subscribers (Unit: Thousands) Total 21,333 21,549 21,771 21,922 21,976 22,133 22,333 22,305 -0.1% 1.7% 213 216 222 150 55 157 200 Net additions -28 N/A N/A 1,181 1,133 1,077 1,067 938 1,030 1,033 Gross additions 999 -3.3% -6.4% 2) Deactivation 968 917 855 917 884 873 833 1,026 23.2% 12.0% Churn rate 1.5% 1.4% 1.3% 1.4% 1.3% 1.3% 1.2% 1.5% 0.3%p 0.1%p LTE 17,393 17,383 17,169 17,153 17,035 16,954 16,774 16,174 -3.6% -5.7% 5G 419 1,055 1,419 1,779 2,237 2,813 3,619 28.7% 155.0% LTE+5G Penetration rate 81.5% 82.6% 83.7% 84.7% 85.6% 86.7% 87.7% 88.7% 1.0%p 4.0%p 3) ARPU (KRW) 31,490 31,727 31,906 31,341 31,773 31,393 31,620 31,946 1.0% 1.9% Note 1) Subscribers: MSIT’s new guidelines for subscriber disclosure (Retroactively applied from 1Q14, MVNO included) Note 2) Deactivation: Mandatory deactivation included Note 3) ARPU = Wireless revenue* / Wireless subscribers** * Wireless revenue(3G, LTE, 5G, IoT included): Revenue of Voice and Data usage (Interconnection/Subscription fee excluded), VAS, Contract/ Bundled Discounts, and etc. included ** Wireless subscribers: Based on MSIT’s guidelines for average billed subscribers in quarter Fixed Line/IPTV 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 QoQ YoY Subscribers (Unit: Thousands) Telephony 14,830 14,554 14,386 14,185 14,033 13,863 13,732 13,582 -1.1% -4.2% PSTN 11,489 11,343 11,192 11,052 10,898 10,736 10,594 10,449 -1.4% -5.5% VoIP 3,340 3,211 3,194 3,133 3,135 3,127 3,138 3,133 -0.1% 0.0% Broadband 8,782 8,849 8,904 8,962 8,962 9,043 9,130 9,171 0.5% 2.3% IPTV (OTV+OTS) 7,966 8,113 8,229 8,351 8,422 8,559 8,687 8,763 0.9% 4.9% ※ Number of IPTV subscribers above deviates from MSIT’s released figure below following IPTV law - Number of KT pay TV subscriber is 7,588,574 in 1H 2020 (6 month average) 20K-IFRS / Separate 3 Subscribers Wireless 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 QoQ YoY 1) Subscribers (Unit: Thousands) Total 21,333 21,549 21,771 21,922 21,976 22,133 22,333 22,305 -0.1% 1.7% 213 216 222 150 55 157 200 Net additions -28 N/A N/A 1,181 1,133 1,077 1,067 938 1,030 1,033 Gross additions 999 -3.3% -6.4% 2) Deactivation 968 917 855 917 884 873 833 1,026 23.2% 12.0% Churn rate 1.5% 1.4% 1.3% 1.4% 1.3% 1.3% 1.2% 1.5% 0.3%p 0.1%p LTE 17,393 17,383 17,169 17,153 17,035 16,954 16,774 16,174 -3.6% -5.7% 5G 419 1,055 1,419 1,779 2,237 2,813 3,619 28.7% 155.0% LTE+5G Penetration rate 81.5% 82.6% 83.7% 84.7% 85.6% 86.7% 87.7% 88.7% 1.0%p 4.0%p 3) ARPU (KRW) 31,490 31,727 31,906 31,341 31,773 31,393 31,620 31,946 1.0% 1.9% Note 1) Subscribers: MSIT’s new guidelines for subscriber disclosure (Retroactively applied from 1Q14, MVNO included) Note 2) Deactivation: Mandatory deactivation included Note 3) ARPU = Wireless revenue* / Wireless subscribers** * Wireless revenue(3G, LTE, 5G, IoT included): Revenue of Voice and Data usage (Interconnection/Subscription fee excluded), VAS, Contract/ Bundled Discounts, and etc. included ** Wireless subscribers: Based on MSIT’s guidelines for average billed subscribers in quarter Fixed Line/IPTV 1Q 19 2Q 19 3Q 19 4Q 19 1Q 20 2Q 20 3Q 20 4Q 20 QoQ YoY Subscribers (Unit: Thousands) Telephony 14,830 14,554 14,386 14,185 14,033 13,863 13,732 13,582 -1.1% -4.2% PSTN 11,489 11,343 11,192 11,052 10,898 10,736 10,594 10,449 -1.4% -5.5% VoIP 3,340 3,211 3,194 3,133 3,135 3,127 3,138 3,133 -0.1% 0.0% Broadband 8,782 8,849 8,904 8,962 8,962 9,043 9,130 9,171 0.5% 2.3% IPTV (OTV+OTS) 7,966 8,113 8,229 8,351 8,422 8,559 8,687 8,763 0.9% 4.9% ※ Number of IPTV subscribers above deviates from MSIT’s released figure below following IPTV law - Number of KT pay TV subscriber is 7,588,574 in 1H 2020 (6 month average) 20