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PRINCIPAL ACTIVITIES AND ORGANIZATION -OPERATIONS OF BUSINESS (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Third-party revenues | ¥ 513,299 | ¥ 1,351,842 | ¥ 2,042,636
Intra-Group revenue | 501,168 | 1,770,244 | 2,528,138
Total revenues | 1,014,467 | 3,122,086 | 4,570,774
Third-party operating cost and expenses | (906,559) | (2,566,806) | (3,854,682)
Intra-Group operating cost and expenses | (118,456) | (565,409) | (750,197)
Total operating cost and expenses | (1,025,015) | (3,132,215) | (4,604,879)
Net income | 164,950 | 6,826 | 16,071
Net cash provided by transactions with external parties | 539,673 | 2,426,562 | 1,789,881
Net cash used in transactions with intra-Group entities | (497,190) | (2,365,128) | (2,809,056)
Net cash (used in)/generated by operating activities | 42,483 | 61,434 | (1,019,175)
Net cash provided by/(used in) transactions with external parties | 8,102 | (18,347) | 440,033
Net cash used in transactions with intra-Group entities | (180,000) |  |
Net cash generated by/(used in) investing activities | (171,898) | (18,347) | 440,033
Net cash provided by/(used in) transactions with external parties | (1,198) | 2,300 |
Net cash provided by/(used in) transactions with intra-Group entities | 0 |  |
Net cash generated by/(used in) financing activities | (1,198) | 2,300 |
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (383) | (1,161) | 288
Net (decrease)/increase in cash, cash equivalents and restricted cash | (130,996) | 44,226 | (578,854)
Cash, cash equivalents and restricted cash at beginning of year | 263,838 | 219,612 | 798,466
Cash, cash equivalents and restricted cash at end of year | ¥ 132,842 | ¥ 263,838 | ¥ 219,612

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