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Income Taxes (Details) - Schedule of net change in the valuation allowance of deferred tax assets - CNY (¥) ¥ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of net change in the valuation allowance of deferred tax assets [Abstract]
Beginning Balance	¥ 356,294	¥ 279,516
Ending Balance	358,428	356,294	¥ 279,516
Additions-change to tax expense	22,533	96,599	¥ 119,264	¥ 77,553
NOL Reductions/expirations	¥ (20,399)	¥ (19,821)

X

- Definition

Amount of deferred tax assets reductions or expiration.

+ References

No definition available.

+ Details

Name:	uk_DeferredTaxAssetsValuationAllowanceReductions
Namespace Prefix:	uk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

No definition available.

+ Details

Name:	uk_DeferredTaxAssetsValuationAllowances
Namespace Prefix:	uk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

Name:	us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration