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Financial Risk Management - Summary of Impact of Fluctuation in Foreign Currency Exchange Rates on Group's Monetary Assets and Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Instruments [Line Items]    
Increase in company's monetary assets and liabilities with the effect of foreign currency exchange rate ₩ 2,109 ₩ 534
Decrease in company's monetary assets and liabilities with the effect of foreign currency exchange rate (2,109) (534)
USD    
Disclosure Of Financial Instruments [Line Items]    
Increase in company's monetary assets and liabilities with the effect of foreign currency exchange rate 1,468 271
Decrease in company's monetary assets and liabilities with the effect of foreign currency exchange rate (1,468) (271)
JPY    
Disclosure Of Financial Instruments [Line Items]    
Increase in company's monetary assets and liabilities with the effect of foreign currency exchange rate 201 123
Decrease in company's monetary assets and liabilities with the effect of foreign currency exchange rate (201) (123)
Others    
Disclosure Of Financial Instruments [Line Items]    
Increase in company's monetary assets and liabilities with the effect of foreign currency exchange rate 440 140
Decrease in company's monetary assets and liabilities with the effect of foreign currency exchange rate ₩ (440) ₩ (140)