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Other investments - Asset management scheme (Details)
Jun. 30, 2023
CNY (¥)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
CNY (¥)
Jul. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Other investments          
Investment in unlisted limited partnership enterprise ¥ 73,870,000        
Investment in Trust Scheme A          
Other investments          
Minimum initial investment         ¥ 100,000,000
Fair value of investment 101,600,000   ¥ 103,537,000    
Investment in Trust Scheme B          
Other investments          
Minimum initial investment       ¥ 100,000,000  
Fair value of investment 103,729,000   ¥ 105,112,000    
Investment in an unlisted enterprise          
Other investments          
Investment in unlisted limited partnership enterprise ¥ 73,870,000 $ 10,409,000