v3.26.1
Property and equipment (Details) - KRW (₩)
₩ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]        
Property, plant and equipment ₩ 7,055,228 ₩ 12,049,988 ₩ 14,867,677 ₩ 20,629,505
Machinery and equipments [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 983,759 1,523,141    
Motor vehicles [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 46,992 1    
Office and other equipment [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 191,733 216,472 283,292 276,711
Furniture and fixtures [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 1,149,844 1,866,729 3,330,540 3,207,619
Right-of-use assets [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 4,682,900 8,434,983 9,425,821 15,089,571
Construction in progress [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 8,662 ₩ 9,950
Note Book Amount [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 15,556,600 21,340,041    
Note Book Amount [Member] | Machinery and equipments [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 2,097,807 2,601,550    
Note Book Amount [Member] | Motor vehicles [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 319,130 51,419    
Note Book Amount [Member] | Office and other equipment [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 591,900 559,571    
Note Book Amount [Member] | Furniture and fixtures [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 3,276,043 4,401,909    
Note Book Amount [Member] | Right-of-use assets        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment 9,271,720 13,716,930    
Note Book Amount [Member] | Construction in progress [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment   8,662    
Accumulated depreciation, amortisation and impairment [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment (7,706,839) (8,325,427)    
Accumulated depreciation, amortisation and impairment [member] | Machinery and equipments [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment (1,114,048) (1,078,409)    
Accumulated depreciation, amortisation and impairment [member] | Motor vehicles [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment (272,138) (51,418)    
Accumulated depreciation, amortisation and impairment [member] | Office and other equipment [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment (400,167) (343,099)    
Accumulated depreciation, amortisation and impairment [member] | Furniture and fixtures [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment (1,700,947) (1,787,018)    
Accumulated depreciation, amortisation and impairment [member] | Right-of-use assets        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment (4,219,540) (5,065,483)    
Accumulated depreciation, amortisation and impairment [member] | Construction in progress [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment      
Accumulated impairment [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment (794,532) (964,626)    
Accumulated impairment [member] | Machinery and equipments [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment    
Accumulated impairment [member] | Motor vehicles [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment    
Accumulated impairment [member] | Office and other equipment [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment    
Accumulated impairment [member] | Furniture and fixtures [Member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment (425,252) (748,162)    
Accumulated impairment [member] | Right-of-use assets        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment ₩ (369,280) (216,464)    
Accumulated impairment [member] | Construction in progress [member]        
IfrsStatementLineItems [Line Items]        
Property, plant and equipment