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COMMITMENTS - Operating lease commitments (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of commitments [Line Items]      
Operating lease commitments ¥ 46,729 ¥ 60,159 ¥ 5,793
Within one year      
Disclosure of commitments [Line Items]      
Operating lease commitments 13,404 13,431 ¥ 5,793
After one year and within five years      
Disclosure of commitments [Line Items]      
Operating lease commitments ¥ 33,325 ¥ 46,728