EXHIBIT 13.1

CERTIFICATION OF PERIODIC FINANCIAL REPORT
PURSUANT TO 18 U.S.C. SECTION 1350

     In connection with the Annual Report of Gravity Co., Ltd. (the “Company”) on Form 20-F for the fiscal year ended December 31, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David Woong-Jin Yoon, Representative Director and Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

1.	The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
2.	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: June 30, 2005

By:	/s/ David Woong-Jin Yoon
	Name:	David Woong-Jin Yoon
	Title:	Representative Director and Chief Executive Officer

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