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ACCRUED LIABILITIES AND OTHER PAYABLES - Additional Information (Details) - CNY (¥)
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of ACCRUED LIABILITIES AND OTHER PAYABLES [Line Items]    
Deposits received from distributors ¥ 16,200,000 ¥ 16,200,000
Minimum    
Disclosure Of ACCRUED LIABILITIES AND OTHER PAYABLES [Line Items]    
Deposits received from distributors 400,000  
Maximum    
Disclosure Of ACCRUED LIABILITIES AND OTHER PAYABLES [Line Items]    
Deposits received from distributors ¥ 1,000,000