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Financial Instruments by Category - Schedule of Carrying Amounts of Financial Instruments by Category (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Financial Assets And Liabilities [Line Items]        
Cash and cash equivalents ₩ 110,632 ₩ 79,428 ₩ 86,051 ₩ 39,095
Short-term financial instruments 71,000 39,500    
Accounts receivables, net 59,761 32,253    
Other receivables, net 8 56    
Other current financial assets 818 233    
Other non-current financial assets 1,324 1,770    
Total 40,413 15,878    
Accounts payables 52,688 37,496    
Total 19,329 10,542    
Financial Assets at Amortized Cost        
Disclosure Of Financial Assets And Liabilities [Line Items]        
Cash and cash equivalents 110,632 79,428    
Short-term financial instruments 71,000 39,500    
Accounts receivables, net 59,761 32,253    
Other receivables, net 8 56    
Other current financial assets 818 233    
Other non-current financial assets 1,324 1,770    
Total 243,543 153,240    
Financial Liabilities at Amortized Cost        
Disclosure Of Financial Assets And Liabilities [Line Items]        
Accounts payables 54,090 37,689    
Accrued expenses (*) 62 19    
Other current liabilities 2,653 1,986    
Other non-current liabilities 3,247 3,008    
Total ₩ 60,052 ₩ 42,702