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Property and Equipment - Summary of Change in Property and Equipment (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment beginning balance ₩ 6,663 ₩ 1,498 ₩ 946
Recognition of right-of-use assets on initial application of IFRS 16   4,254  
Acquisitions/Capital expenditure 4,855 3,722 1,141
Depreciation (3,783) (2,748) (545)
Disposals (17) (75) (59)
Foreign exchange differences (23) 12 15
Property, plant and equipment ending balance 7,695 6,663 1,498
Right-of-use Assets      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment beginning balance 4,946    
Recognition of right-of-use assets on initial application of IFRS 16   4,453  
Acquisitions/Capital expenditure 3,784 2,637  
Depreciation (2,957) (2,135)  
Disposals (13) (15)  
Foreign exchange differences (23) 6  
Property, plant and equipment ending balance 5,737 4,946  
Computer and Other Equipment      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment beginning balance 1,057 888 654
Recognition of right-of-use assets on initial application of IFRS 16   (199)  
Acquisitions/Capital expenditure 850 711 550
Depreciation (529) (344) (297)
Disposals (1)   (32)
Foreign exchange differences 3 1 13
Property, plant and equipment ending balance 1,380 1,057 888
Furniture and Fixtures      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment beginning balance 443 484 165
Acquisitions/Capital expenditure 81 211 472
Depreciation (213) (198) (133)
Disposals (1) (58) (22)
Foreign exchange differences   4 2
Property, plant and equipment ending balance 310 443 484
Construction in Progress      
Disclosure Of Property Plant And Equipment [Line Items]      
Acquisitions/Capital expenditure 128    
Property, plant and equipment ending balance 128    
Vehicles      
Disclosure Of Property Plant And Equipment [Line Items]      
Acquisitions/Capital expenditure 9    
Depreciation (1)    
Property, plant and equipment ending balance 8    
Leasehold Improvements      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment beginning balance 217 126 127
Acquisitions/Capital expenditure 3 163 119
Depreciation (83) (71) (115)
Disposals (2) (2) (5)
Foreign exchange differences (3) 1  
Property, plant and equipment ending balance ₩ 132 ₩ 217 ₩ 126