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Financial Risk Management - Summary of Financial Liabilities by Maturity (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable ₩ 60,547 ₩ 44,352
Accounts Payable    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 54,090 37,689
Accrued Expenses    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 62 1,175
Other Liabilities    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 6,395 5,488
Less Than Three months    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 44,312 23,147
Less Than Three months | Accounts Payable    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 43,438 21,374
Less Than Three months | Accrued Expenses    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 62 1,175
Less Than Three months | Other Liabilities    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 812 598
Carrying amount [member]    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 60,052 43,858
Carrying amount [member] | Accounts Payable    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 54,090 37,689
Carrying amount [member] | Accrued Expenses    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 62 1,175
Carrying amount [member] | Other Liabilities    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 5,900 4,994
Three Months to One Year    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 11,357 17,775
Three Months to One Year | Accounts Payable    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 9,250 16,122
Three Months to One Year | Other Liabilities    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 2,107 1,653
One Year to Two Year    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 3,548 1,973
One Year to Two Year | Accounts Payable    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 1,402 193
One Year to Two Year | Other Liabilities    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 2,146 1,780
Two Year to Three Year    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 597 1,029
Two Year to Three Year | Other Liabilities    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 597 1,029
Three Year to Five Year    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable 733 428
Three Year to Five Year | Other Liabilities    
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk [Line Items]    
Other payable ₩ 733 ₩ 428