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Prepayments and other assets - Rental and other deposit (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Prepayment and other assets    
Rental and other deposits ¥ 9,656 ¥ 25,030
Less: Allowance for doubtful accounts (3,984) (12,395)
Rental and other deposits, net ¥ 5,672 ¥ 12,635