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Statements of Cash Flows - Schedule of Cash Generated From Operations (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Cash Flow Statement [Abstract]      
Profit for the year ₩ 67,310 ₩ 84,902 ₩ 131,982
Depreciation expense 6,211 6,023 5,252
Amortization expense 4,608 3,211 2,406
Bad debt expenses 752 589 1,402
Unrealized foreign currency loss 4,521 2,026 1,595
Interest expense 282 135 162
Loss on disposal of property and equipment 0 6 0
Loss on disposal of intangible assets 4 0 0
Impairment loss on intangible assets 53 615 1,531
Impairment loss on other non-current assets 1,876 962 0
Post-employment benefit expense 352 127 23
Income tax expense 23,629 21,445 36,717
Unrealized foreign currency gain (2,323) (3,579) (1,417)
Interest income (15,822) (17,059) (11,492)
Gain on disposal of property and equipment (4) (8) (20)
Others 0 0 6
Change in accounts receivable 22,169 (1,886) 2,365
Change in other receivables (1,249) 2,748 (3,770)
Change in prepaid expenses (5,524) (4,493) 397
Change in prepayment 0 0 (1)
Change in other current assets 102 (124) (696)
Change in other non-current assets (3,956) (2,318) (3,486)
Change in accounts payable (9,509) (2,879) (13,837)
Change in deferred revenue (7,617) 5,984 (1,292)
Change in withholdings 276 (1,546) (262)
Change in accrued expenses (65) 226 255
Change in other current liabilities 0 0 165
Change in other non-current liabilities (3) 467 2,247
Total ₩ 86,073 ₩ 95,574 ₩ 150,232