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Leases (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Right-of-use assets    
Properties ¥ 89,574,000 ¥ 144,001,000
Lease liabilities    
Non current 44,553,000 97,473,000
Current 47,030,000 57,417,000
Lease liabilities 91,583,000 154,890,000
Additions to the right-of-use assets during the year ¥ 76,534,000 ¥ 118,030,000
Weighted average lessee's incremental borrowing rate 4.79% 4.84%