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Intangible Assets - Summary of Changes In Intangible Assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Intangible Assets [Line Items]      
Intangible assets at beginning balance ₩ 1,717 ₩ 1,163 ₩ 1,036
Acquisitions/Capital expenditure 2,896 1,514 1,617
Amortization (1,137) (905) (868)
Disposals   (20)  
Impairment (115) (52) (623)
Foreign exchange differences 2 17 1
Intangible assets at ending balance 3,363 1,717 1,163
Software      
Disclosure Of Intangible Assets [Line Items]      
Intangible assets at beginning balance 1,144 991 64
Acquisitions/Capital expenditure 1,986 951 1,523
Amortization (897) (807) (597)
Disposals   (8)  
Foreign exchange differences 1 17 1
Intangible assets at ending balance 2,234 1,144 991
License      
Disclosure Of Intangible Assets [Line Items]      
Intangible assets at beginning balance   57 843
Acquisitions/Capital expenditure     78
Amortization   (5) (241)
Impairment   (52) (623)
Intangible assets at ending balance     57
Industrial Property Rights      
Disclosure Of Intangible Assets [Line Items]      
Intangible assets at beginning balance 186 72 77
Acquisitions/Capital expenditure 185 153 16
Amortization (39) (27) (21)
Disposals   (12)  
Intangible assets at ending balance 332 186 72
Other Intangible Assets      
Disclosure Of Intangible Assets [Line Items]      
Intangible assets at beginning balance 387 43 52
Acquisitions/Capital expenditure 725 410  
Amortization (201) (66) (9)
Impairment (115)    
Foreign exchange differences 1    
Intangible assets at ending balance ₩ 797 ₩ 387 ₩ 43