Income Taxes - Schedule of Deferred Tax Liabilities (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Related to acquired intangible assets	¥ 124,450	¥ 1,557

Deferred tax liabilities, acquired intangible assets.

No definition available.

Name:	ysg_DeferredTaxLiabilitiesAcquiredIntangibleAssets
Namespace Prefix:	ysg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant