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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract] |  |  |
Profit before income tax | ₩ 88,011 | ₩ 51,256 | ₩ 34,439
Income tax using the statutory tax rate of each country | 19,828 | 12,063 | 8,994
Expenses not deductible for tax purpose | 20 | 42 | 62
Foreign tax credits | 3,223 | 4,854 | 5,196
Changes in estimates related to prior period | 11 | (4,347) |
Utilization of previously unrecognized deferred tax asset | (412) |  | (5,347)
Change in deferred tax due to carry-forward deficits |  | (33) | (6,265)
Effect of change of foreign currency exchange rate | (19) | (12) | (221)
Tax credit | (1,022) | (543) |
Tax of non-recycled corporation income | 668 |  |
Changes in deferred tax liabilities related to investment in subsidiaries | 2,577 |  |
Others | 581 | (498) | 634
Total adjustments | 5,627 | (537) | (5,941)
Income tax expense | ₩ 25,455 | ₩ 11,526 | ₩ 3,053
Effective tax rate | 29.00% | 22.00% | 9.00%

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