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Income Tax Expense - Summary of Differences Between Tax Expense and Amount Arise Using Statutory Tax Rate Applicable to Profits of Entities (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |
Profit before income tax | ₩ 168,699 | ₩ 109,882 | ₩ 99,301
Income tax using the statutory tax rate of each country | 31,300 | 23,951 | 25,957
Adjustments |  |  |
Expenses not deductible for tax purpose | 9 | 7 | 11
Non taxable income | (131) | 0 | 0
Withholding tax | 8,615 | 5,028 | 4,500
Utilization of previously unrecognized loss carried forward | (714) | (239) | 0
Adjustments recognized related to prior period incomes | 0 | 0 | 1,647
Tax credit | (1,174) | (2,131) | (765)
Corporate tax on unappropriated earnings | (134) | 1,085 | 487
Changes in deferred tax liabilities related to investment in subsidiaries | (422) | (1,101) | 1,351
Others | (632) | 224 | 233
Total adjustments | 5,417 | 2,873 | 7,464
Income tax expense | ₩ 36,717 | ₩ 26,824 | ₩ 33,421
Effective tax rate | 22.00% | 24.00% | 34.00%

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