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Credit risk (Details) - CNY (¥)
Dec. 31, 2023
Dec. 31, 2022
Statement [Line Items]    
Loan Receivables ¥ 248,350,000 ¥ 753,043,000
Accrued Interest 157,726,000 443,359,000
Gross Loan Receivables 406,076,000 1,196,402,000
Credit Impairment Losses (212,394,000) (640,290,000)
Carrying Amount 193,682,000 556,112
Stage 1 [Member]    
Statement [Line Items]    
Loan Receivables 0 0
Accrued Interest 0 0
Gross Loan Receivables 0 0
Credit Impairment Losses 0 0
Carrying Amount 0 0
Stage 2 [Member]    
Statement [Line Items]    
Loan Receivables 0 0
Accrued Interest 0 0
Gross Loan Receivables 0 0
Credit Impairment Losses 0 0
Carrying Amount 0 0
Stage 3 [Member]    
Statement [Line Items]    
Loan Receivables 248,350,000 753,043,000
Accrued Interest 157,726,000 443,359,000
Gross Loan Receivables 406,076,000 1,196,402,000
Credit Impairment Losses (212,394,000) (640,290,000)
Carrying Amount ¥ 193,682,000 ¥ 556,112,000