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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Comprehensive Income [Abstract]      
Revenues ₩ 405,953 ₩ 360,967 ₩ 286,770
Online games 89,545 42,322 39,453
Mobile games 298,324 301,903 239,489
Other revenue 18,084 16,742 7,828
Cost of revenues 239,045 265,788 210,044
Gross profit 166,908 95,179 76,726
Selling, general and administrative expenses (62,400) (36,873) (34,820)
Research and development (15,034) (9,503) (8,018)
Other income 658 353 122
Other expenses (1,764) (493) (642)
Operating profit 88,368 48,663 33,368
Finance income 3,476 4,187 2,073
Finance costs (3,833) (1,594) (1,002)
Profit before income tax 88,011 51,256 34,439
Income tax expenses 25,455 11,526 3,053
Profit for the year 62,556 39,730 31,386
Items that may be subsequently reclassified to income or loss      
Foreign currency translation adjustments (1,319) 136 178
Total comprehensive income (loss) for the year 61,237 39,866 31,564
Profit (loss) attributable to:      
Owners of the Parent Company 62,703 39,876 31,443
Non‑controlling interest (147) (146) (57)
Total comprehensive income (loss) attributable to:      
Owners of the Parent Company 61,384 40,012 31,621
Non-controlling interest ₩ (147) ₩ (146) ₩ (57)
Earnings per share (in Korean won)      
Basic earnings per share ₩ 9,023 ₩ 5,738 ₩ 4,525
Diluted earnings per share ₩ 9,023 ₩ 5,738 ₩ 4,525