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Classification of Expenses By Nature - Details of Classification of Expenses By Nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expense By Nature [Abstract]      
Advertising expenses ₩ 30,084 ₩ 14,948 ₩ 17,263
Fees and commissions 230,412 249,210 195,173
Lease expenses 920 1,496 2,604
Outsourcing expenses 9,500 7,875 6,176
Salaries 32,340 26,935 23,137
Expenses related to defined contribution plans 2,030 1,807 1,546
Employee benefits 3,329 3,026 2,655
Depreciation 3,783 2,748 545
Amortization 1,137 905 868
Other expenses 2,944 3,214 2,915
Total expenses, by nature ₩ 316,479 ₩ 312,164 ₩ 252,882