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INCENTIVE PAYABLES TO MEMBERS - Schedule of Incentive payables to members (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Payables and Accruals [Abstract] |  |
Incentive payables to members | ¥ 265,612 | ¥ 312,170

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents Discounts and referral incentive payable. + References No definition available. + Details
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Namespace Prefix: | yj_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant