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Statements of Cash Flows - Summary of Cash Generated From Operations (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Cash Flow Statement [Abstract] |  |  |
Profit for the year | ₩ 65,880 | ₩ 62,556 | ₩ 39,730
Depreciation expense | 4,570 | 3,783 | 2,748
Amortization expense | 1,748 | 1,137 | 905
Bad debt expenses | 933 | 713 | 281
Unrealized foreign currency loss | 211 | 682 | 267
Interest expense | 115 | 186 | 277
Loss on disposal of property and equipment | 57 | 0 | 0
Impairment loss on intangible assets | 281 | 115 | 52
Impairment loss on other non-current assets | 1,087 | 1,456 | 434
Post-employment benefit expense (Reversal of allowance for retirement benefit) | 23 | 62 | (4)
Income tax expense | 33,421 | 25,455 | 11,526
Unrealized foreign currency gain | (134) | (321) | (119)
Interest income | (1,383) | (1,088) | (1,626)
Gain on disposal of property and equipment | (7) | 0 | (3)
Reversal of allowance for doubtful accounts | (132) | (50) | (34)
Gain on disposal of intangible assets | 0 | 0 | (1)
Others | 214 | 0 | 0
Change in accounts receivables | 5,530 | (29,116) | 30,143
Change in other receivables | (1,082) | 60 | 232
Change in prepaid expenses | (3,296) | (2,134) | 1,981
Change in prepayment | 2,165 | (2,755) | (204)
Change in other current assets | 243 | 622 | (556)
Change in other non-current assets | 144 | 2,255 | (1,860)
Change in accounts payables | (8,512) | 15,510 | (37,145)
Change in deferred revenue | 1,185 | 3,332 | (9,631)
Change in withholdings | 686 | 1,218 | (397)
Change in accrued expenses | 118 | 181 | 140
Change in other current liabilities | 34 | (1,256) | 113
Change in other non-current liabilities | (99) | (868) | (463)
Change in advance receipt | 0 | 0 | 434
Total | ₩ 103,572 | ₩ 81,735 | ₩ 37,220

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