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Selling, General and Administrative Expenses - Summary of Selling, General and Administrative Expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Selling General And Administrative Expenses [Line Items]      
Advertising expenses ₩ 30,084 ₩ 14,948 ₩ 17,263
Fees and commissions 230,412 249,210 195,173
Lease expenses 920 1,496 2,604
Salaries 32,340 26,935 23,137
Expenses related to defined contribution plans 1,968 1,812 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 selling, general and administrative expense 62,400 36,873 34,820
Selling, General and Administrative Expenses      
Disclosure Of Selling General And Administrative Expenses [Line Items]      
Advertising expenses 30,084 14,948 17,263
Fees and commissions 13,928 7,262 5,727
Lease expenses 460 665 941
Salaries 11,761 8,643 7,080
Expenses related to defined contribution plans 585 455 387
Employee benefits 1,419 1,253 1,140
Depreciation 1,424 761 233
Amortization 597 745 581
Other expenses 2,142 2,141 1,468
Total selling, general and administrative expense ₩ 62,400 ₩ 36,873 ₩ 34,820