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LEASES - Consolidated income statement (Details) - CNY (¥)
¥ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Depreciation charge of right-of-use assets ¥ 635 ¥ 134
Income Statement Locations    
Depreciation charge of right-of-use assets 7,035 6,279
Interest expense ¥ 1,094 ¥ 410