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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]
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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- References

No definition available.

+ Details

Name:	uk_ScheduleOfSupplementalNoncashInformationAbstract
Namespace Prefix:	uk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration