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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2023
Revenue From Contracts With Customers [Abstract]  
Details of Revenue from Contracts with Customers Based on Service Contract and Timing of Satisfaction of Performance Obligations Details of revenue from contracts with customers based on the service contract type and the timing of satisfaction of performance obligations are as follows:
202320222021
(In millions of Korean won)
Service contract
Micro-transaction revenue
Online game₩70,566 ₩80,147 ₩64,382 
Mobile game568,665 261,622 164,646 
639,231 341,769 229,028 
Royalties and license fees
Online game10,451 9,109 10,988 
Mobile game60,939 97,150 155,518 
71,390 106,259 166,506 
Others14,895 15,590 18,404 
725,516 463,618 413,938 
Timing of satisfaction of performance obligations
At a point in time119 25 8 
Over time725,397 463,593 413,930 
₩725,516 ₩463,618 ₩413,938 
Account Receivables, Incremental Costs of Obtaining a Contract, and Contract Liabilities Accounts receivables, incremental costs of obtaining a contract, and contract liabilities related to contracts with customers as of December 31, 2023 and 2022 are as follows:
20232022
(In millions of Korean won)
Accounts receivable₩71,213 ₩77,257 
Incremental costs of obtaining a contract (Prepaid expenses)1,557 1,722 
Contract liabilities (Deferred revenue)19,875 18,574 
Micro-transaction revenue17,159 16,788 
Royalties and license fees2,426 101 
Website and application development290 1,685 
Transaction Price Allocated to Unsatisfied Performance Obligation Transaction price allocated to unsatisfied performance obligations as of December 31, 2023, 2022 and 2021 are as follows:
202320222021
(In millions of Korean won)
Micro-transaction revenue
Online game₩10,216 ₩9,918 ₩9,374 
Mobile game6,943 6,869 3,248 
17,159 16,787 12,622 
Royalties and license fees
Online game164 49 96 
Mobile game2,262 52 21 
2,426 101 117 
Website and application development290 1,686 840 
Total₩19,875 ₩18,574 ₩13,579 
Details of Incremental Costs of Obtaining Contract Recognized as Assets Details of incremental costs of obtaining a contract recognized as assets as of and for the years ended December 31, 2023 and 2022 are as follows:
December 31,
2023		December 31,
2022
(In millions of Korean won)
Incremental costs of obtaining a contract₩1,557 ₩1,722 
Details of Amortization Costs Recognized as Cost of Revenues
Details of incremental costs of obtaining a contract recognized as cost of revenues as of December 31, 2023, 2022 and 2021 are as follows:
202320222021
(In millions of Korean won)
Incremental costs of obtaining a contract recognized as cost of revenues₩1,722 ₩861 ₩1,277