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FINANCE COSTS (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
FINANCE COSTS      
Interest on lease liability ¥ 2,748 ¥ 315 ¥ 0
Interest on bank borrowings ¥ 0   ¥ 0