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Financial assets at fair value through profit or loss (Details) - CNY (¥)
Dec. 31, 2022
Dec. 31, 2021
Financial assets at fair value through profit or loss    
Carrying amount ¥ 690,627,000 ¥ 2,071,653,000
Contingent refundable consideration    
Financial assets at fair value through profit or loss    
Carrying amount   676,000
Wealth management products    
Financial assets at fair value through profit or loss    
Carrying amount 690,627,000 2,070,977,000
Financial assets at fair value through profit or loss ¥ 690,627,000 ¥ 2,070,977,000