Basis of preparation and material accounting policies - Basis of presentation (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Accounting policies [Abstract] | |
| Basis of preparation of financial statements | The Group’s consolidated financial statements are prepared in accordance with International Financial Reporting Standards (“IFRS”) Accounting Standards as issued by the International Accounting Standards Board (“IASB”). |
| Description of nature of financial statements | consolidated financial statements |
| Date of end of reporting period | Dec. 31, 2025 |
| Period covered by financial statements | December 31, 2025 |
| Description of presentation currency | Korean Won |
| Description of functional currency | Korean Won |
| Level of rounding used in financial statements | Korean Won in millions |
| Description of accounting policy for functional currency | The Group operates primarily in Korea and its official accounting records are maintained in Korean Won. |
| Methods of translation used to determine supplementary information | The United States dollar (“U.S. dollar” or “US$” or “USD”) amounts are provided herein as supplementary information solely for the convenience of readers outside Korea. Korean Won amounts are expressed in U.S. Dollars at the rate of 1,444.55 Korean Won to US$1.00, the noon buying exchange rate in effect on December 31, 2025, as quoted by the Federal Reserve Bank of New York in the United States. Such convenience translation into U.S. Dollars should not be construed as representations that Korean Won amounts have been, could have been, or could in the future be, converted at this or any other rate of exchange. |
| Explanation of measurement bases used in preparing financial statements | The consolidated financial statements, as described in following paragraphs of accounting policy, are prepared at the end of each reporting period in historical cost basis, except for certain non-current assets and financial assets that are either revalued or measured in fair value. Historical cost is generally measured at the fair value of consideration given to acquire assets. |