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Income Taxes - Summary of movement of valuation allowance (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Taxes    
Balance at the beginning of the year ¥ 378,851 ¥ 378,815
Additions 54,097 47,941
Reversals (74,379) (47,905)
Balance at end of the year ¥ 358,569 ¥ 378,851