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Statements of Cash Flows - Summary of Significant Non-cash Transactions (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] |  |  |
Reclassification of prepayment to intangible assets | ₩ 219 | ₩ 72 | ₩ 120
Increase of accounts payables relating to the acquisition of software | 667 | 1,144 | 33
Acquisitions of right-of-use assets | ₩ 6,055 | ₩ 3,784 | ₩ 2,637

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