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COMMITMENTS - Capital commitments expenditures contracted (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of commitments [Line Items]      
Lease liabilities ¥ 64,947    
Other property, plant and equipment [member]      
Disclosure of commitments [Line Items]      
Authorised capital commitments but not contracted for 0 ¥ 0 ¥ 0
Chengdu Future Talented Management and Consulting Co, Ltd      
Disclosure of commitments [Line Items]      
Contractual capital commitments 30,000,000 30,000,000 0
Antelope Holdings (Chengdu) Co., Ltd      
Disclosure of commitments [Line Items]      
Lease liabilities ¥ 65,250,000 ¥ 0 ¥ 0