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SIGNIFICANT RELATED PARTY TRANSACTIONS (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]      
Amounts owed to related parties   ¥ 36,348 ¥ 36,217
Current payables to related parties, Total   36,348 36,217
Stuart Management Co [Member]      
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]      
Amounts owed to related parties   ¥ 0 ¥ 0
Service fees paid to Stuart Management Co. ¥ 40