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Statements of Cash Flows - Summary of Cash Generated From Operations (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Cash Flow Statement [Abstract]      
Profit (loss) for the year ₩ 62,556 ₩ 39,730 ₩ 31,386
Depreciation expense 3,783 2,748 545
Amortization expense 1,137 905 868
Bad debt expenses 713 281 151
Unrealized foreign currency loss 682 267 99
Interest expense 186 277  
Loss on retirement and disposal of property and equipment     5
Impairment loss on intangible assets 115 52 623
Impairment loss on other non-current assets 1,456 434  
Post-employment benefit expense (Reversal of allowance for retirement benefit) 62 (4) 50
Income tax expense 25,455 11,526 3,053
Unrealized foreign currency gain (321) (119) (81)
Interest income (1,088) (1,626) (819)
Gain on disposal of property and equipment   (3) (16)
Reversal of allowance for doubtful accounts (50) (34)  
Gain on disposal of intangible assets   (1)  
Change in accounts receivables (29,116) 30,143 (18,573)
Change in other receivables 60 232 406
Change in prepaid expenses (2,134) 1,981 544
Change in prepayment (2,755) (204)  
Change in other current assets 622 (556) 192
Change in other non-current assets 2,255 (1,860) (1,137)
Change in accounts payables 15,510 (37,145) 27,319
Change in deferred revenue 3,332 (9,631) (2,707)
Change in withholdings 1,218 (397) 580
Change in accrued expenses 181 140 (7)
Change in other current liabilities (1,256) 113 (13)
Change in long-term deferred revenue   0 100
Change in other non-current liabilities (868) (463)  
Change in advance receipt   434  
Total ₩ 81,735 ₩ 37,220 ₩ 42,571