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Segment Information - Summary of Segment Information (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Operating Segments [Line Items]      
Revenue ₩ 405,953 ₩ 360,967 ₩ 286,770
Depreciation amortization 4,920 3,653 1,414
Operating profit 88,368 48,663 33,368
Operating Segments      
Disclosure Of Operating Segments [Line Items]      
Revenue 466,608 414,412 308,178
Depreciation amortization 4,920 3,653 1,426
Operating profit 88,118 46,971 30,167
Operating Segments | Online      
Disclosure Of Operating Segments [Line Items]      
Revenue 107,949 48,182 41,288
Depreciation amortization 1,609 1,401 238
Operating profit 45,115 7,754 4,286
Operating Segments | Mobile      
Disclosure Of Operating Segments [Line Items]      
Revenue 336,326 346,878 257,364
Depreciation amortization 1,823 1,145 473
Operating profit 42,493 38,655 24,795
Operating Segments | Others      
Disclosure Of Operating Segments [Line Items]      
Revenue 22,333 19,352 9,526
Depreciation amortization 1,488 1,107 715
Operating profit 510 562 1,086
Elimination of intersegment amounts [member]      
Disclosure Of Operating Segments [Line Items]      
Revenue (60,655) (53,445) (21,408)
Depreciation amortization     (12)
Operating profit ₩ 250 ₩ 1,692 ₩ 3,201