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Related parties - Key management personnel compensation (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Key management personnel compensation [Abstract] |  |  |  |
Short-term employee benefits |  | ₩ 21,268 | ₩ 21,963 | ₩ 25,007
Severance benefits |  | 701 | 824 | 809
Share-based payment transactions | [1] | 24,840 | 12,478 | 11,862
Key management personnel compensation |  | ₩ 46,809 | ₩ 35,265 | ₩ 37,678
[1] | The above share-based compensation expenses are costs related to share-based compensation arrangements that are still within the vesting period.

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