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INCOME TAX EXPENSE/(CREDIT) - Analysis of the deferred tax balances in the consolidated statements (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
INCOME TAX EXPENSE/(CREDIT)        
Deferred tax assets ¥ 0 ¥ 0    
Deferred tax liabilities 0 0    
Deferred tax liability (asset) ¥ 0 ¥ 0 ¥ (209) ¥ (4,765)