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Business combination - Summary of Amounts Recognised As Of Acquisition Date For Each Major Class Of Assets Acquired And Liabilities Assumed (Details) - HIEP HIEP THANH Investment Company Limited - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Oct. 20, 2025
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Disclosure Of Amounts Recognised As Of Acquisition Date For Each Major Class Of Assets Acquired And Liabilities Assumed [Line Items] |  |  |
Property and equipment | [1] |  | ₩ 188,110
Investment property |  |  | 207,833
Trade and other receivables |  |  | 50,955
Cash and cash equivalents |  | ₩ 8,515 | 8,515
Deferred tax liabilities |  |  | 35,183
Trade and other payables |  |  | 284,634
Identifiable net assets |  | ₩ 135,596 | ₩ 135,596
[1] | Investment property of the acquiree amounting to W 188,029 million was classified as property and equipment in the Group’s consolidated statement of financial position.

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