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Prepaid expenses and others (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Prepaid rental to a shareholder(1) ¥ 0 ¥ 448
Receivable from a related party(2) 0 251
Prepaid expenses 295 184
Others 0 155
Total ¥ 295 ¥ 1,038