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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
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%