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RELATED PARTY TRANSACTIONS - Additional Information (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Wong Kung Tok [Member]        
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]        
Proceeds from borrowings, classified as financing activities ¥ 35,057,000 ¥ 35,057,000    
Sound Treasure Limited [Member]        
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]        
Borrowings 1,160,000 1,160,000 $ 167,000 $ 167,000
Alex Ng [Member]        
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]        
Borrowings ¥ 131,000,000 ¥ 131,000,000 $ 20,000,000 $ 20,000,000