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SEGMENT INFORMATION (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
segment
Dec. 31, 2019
CNY (¥)
Number of operating segments | segment 1  
Hong Kong SAR    
Long-lived assets | ¥ ¥ 1,627,832 ¥ 1,605,892