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Business combination - Summary of fair value of assets acquired and liabilities assumed as of acquisition (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about business combination [line items]      
Bargain purchase gain recognized ₩ 3,077 ₩ 0 ₩ 0
HIEP HIEP THANH Investment Company Limited      
Disclosure of detailed information about business combination [line items]      
Name of acquiree HIEP HIEP THANH INVESTMENT COMPANY LIMITED    
Date of acquisition Oct. 20, 2025    
Consideration transferred ₩ 132,519    
Fair value of identifiable assets recognized 455,413    
Fair value of identifiable liabilities recognized 319,817    
Bargain purchase gain recognized [1] 3,077    
Operating revenue since the acquisition date ₩ 2,796    
[1] The bargain purchase gain arose as the consideration transferred was determined by taking into consideration the market conditions at the transaction date, including exchange rate fluctuations, the seller’s negotiating position, and the urgency to complete the transaction. After reassessing the related fair value measurements to confirm that there were no measurement errors, the Group recognized the amount as a bargain purchase gain.