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SHORT TERM INVESTMENT (Debt Investment) (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
SHORT TERM INVESTMENT    
Short term investment ¥ 0 ¥ 50,000
Unrealized gains or losses 0 0
Other than temporary impairment ¥ 0 ¥ 0