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Share-Based Compensation (Details) - Schedule of the fair values of the options granted - ¥ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule of the fair values of the options granted [Abstract]
Weighted average grant date fair value of option per share	¥ 53.57	¥ 41.51
Aggregate grant date fair value of options	373,832	575,788

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- References

No definition available.

+ Details

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

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Period Type:	duration

X

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Data Type:	num:perShareItemType
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