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Lease - Summary of Amounts Recognized in Consolidated Statements of Profit or Loss (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Presentation Of Leases For Lessee [Abstract]    
Interest expense relating to lease liabilities (included in finance cost) ₩ 186 ₩ 277
Expense relating to short-term leases 123 322
Expense relating to leases of low-value assets that are not short-term leases ₩ 9 ₩ 10