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Property and Equipment - Summary of Property Plant and Equipment (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net ₩ 7,695 ₩ 6,663 ₩ 1,498 ₩ 946
Right-of-use Assets        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 5,737 4,946    
Computer and Other Equipment        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 1,380 1,057 888 654
Furniture and Fixtures        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 310 443 484 165
Construction in Progress        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 128      
Leasehold Improvements        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 132 217 ₩ 126 ₩ 127
Vehicles        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 8      
Accumulated Depreciation        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net (13,214) (10,910)    
Accumulated Depreciation | Right-of-use Assets        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net (5,763) (3,681)    
Accumulated Depreciation | Computer and Other Equipment        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net (4,694) (4,614)    
Accumulated Depreciation | Furniture and Fixtures        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net (1,728) (1,541)    
Accumulated Depreciation | Leasehold Improvements        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net (1,028) (1,074)    
Accumulated Depreciation | Vehicles        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net (1)      
Acquisition Price        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 20,909 17,573    
Acquisition Price | Right-of-use Assets        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 11,500 8,627    
Acquisition Price | Computer and Other Equipment        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 6,074 5,671    
Acquisition Price | Furniture and Fixtures        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 2,038 1,984    
Acquisition Price | Construction in Progress        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 128      
Acquisition Price | Leasehold Improvements        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net 1,160 ₩ 1,291    
Acquisition Price | Vehicles        
Disclosure Of Property Plant And Equipment [Line Items]        
Property and equipment, net ₩ 9