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Finance Income And Costs - Summary of Finance Income And Cost (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Finance Income And Costs [Line Items]      
Finance income ₩ 3,476 ₩ 4,187 ₩ 2,073
Finance costs 3,833 1,594 1,002
Interest Income      
Disclosure Of Finance Income And Costs [Line Items]      
Finance income 1,088 1,626 819
Unrealized Foreign Currency Gain      
Disclosure Of Finance Income And Costs [Line Items]      
Finance income 321 119 81
Gain on Foreign Currency Transactions      
Disclosure Of Finance Income And Costs [Line Items]      
Finance income 2,067 2,442 1,173
Unrealized Foreign Currency Loss      
Disclosure Of Finance Income And Costs [Line Items]      
Finance costs 682 267 99
Loss on Foreign Currency Transactions      
Disclosure Of Finance Income And Costs [Line Items]      
Finance costs 2,965 1,050 891
Others      
Disclosure Of Finance Income And Costs [Line Items]      
Finance costs ₩ 186 ₩ 277 ₩ 12