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Income Taxes - Composition of income tax (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Composition of income tax      
Current income tax expense/(credit) ¥ 64 ¥ (42) ¥ 361
Total ¥ 64 ¥ (42) ¥ 361