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Prepaid Expense and Other Assets - Summary of movements in impairment provision (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Impairment Provision on Prepaid Expenses    
Balance at beginning of the year ¥ (39,372) ¥ (39,000)
Additions (1,000) (372)
Write-off 372  
Balance at end of the year ¥ (40,000) ¥ (39,372)