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Finance costs - net (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Finance income      
Interest income on bank deposits ¥ 14,709 ¥ 28,823 ¥ 77,237
Finance costs      
Interest expense on borrowings (17,303) (56,534) (127,585)
Interest expense on lease liabilities (7,578) (5,803) (7,736)
Interest expense on redemption liability (10,287) (12,406) (14,326)
Bank charges (2,005) (1,894) (716)
Total finance costs (37,173) (76,637) (150,363)
Finance costs - net ¥ (22,464) ¥ (47,814) ¥ (73,126)