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Lease (Details) - Schedule of supplemental noncash information - CNY (¥) ¥ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of supplemental noncash information [Abstract] |  |  |  |  |
ROU assets acquired in exchange for equity interests |  |  |  |  | ¥ 155,350
Operating lease liabilities arising from obtaining ROU assets | ¥ 35,291 | ¥ 8,212 | ¥ 11,902 | ¥ 315,027 | ¥ 977,539

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- Definition Operating lease liabilities arising from obtaining ROU assets. + References No definition available. + Details
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Namespace Prefix: | uk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition ROU assets acquired in exchange for equity interests. + References No definition available. + Details
Name: | uk_ROUAssetsAcquiredInExchangeForEquityInterests
Namespace Prefix: | uk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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