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General Information - Schedule of Consolidated Financial Information Subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Significant Investments In Subsidiaries [Line Items]      
Total assets ₩ 265,372 ₩ 175,425  
Total liabilities 88,024 59,659  
Revenue 405,953 360,967 ₩ 286,770
Profit (loss) for the year 62,556 39,730 ₩ 31,386
Gravity Interactive, Inc.      
Disclosure Of Significant Investments In Subsidiaries [Line Items]      
Total assets 31,849 39,296  
Total liabilities 23,405 29,112  
Revenue 123,055 230,029  
Profit (loss) for the year 1,138 12,804  
Gravity Entertainment Corporation      
Disclosure Of Significant Investments In Subsidiaries [Line Items]      
Total assets   44  
Total liabilities   52  
Revenue   263  
Profit (loss) for the year 8 (443)  
Gravity NeoCyon, Inc. (Formerly, NeoCyon, Inc.)      
Disclosure Of Significant Investments In Subsidiaries [Line Items]      
Total assets 11,069 9,145  
Total liabilities 7,422 6,728  
Revenue 26,368 25,347  
Profit (loss) for the year (1,754) (982)  
Gravity Communications Co.,Ltd.      
Disclosure Of Significant Investments In Subsidiaries [Line Items]      
Total assets 33,717 19,964  
Total liabilities 10,070 8,227  
Revenue 41,677 21,811  
Profit (loss) for the year 12,281 5,637  
PT. Gravity Game Link      
Disclosure Of Significant Investments In Subsidiaries [Line Items]      
Total assets 2,185 960  
Total liabilities 664 202  
Revenue 4,881 745  
Profit (loss) for the year (315) (437)  
Gravity Game Tech Co.,Ltd.      
Disclosure Of Significant Investments In Subsidiaries [Line Items]      
Total assets 21,093 4,008  
Total liabilities 6,315 2,624  
Revenue 39,147 2,295  
Profit (loss) for the year 13,989 (1,973)  
Gravity Game Arise Co., Ltd.      
Disclosure Of Significant Investments In Subsidiaries [Line Items]      
Total assets 2,637 1,841  
Total liabilities 2,066 1,343  
Revenue 2,483 771  
Profit (loss) for the year ₩ 82 ₩ (35)