Shim Ja Yoon, known as professionally as Yoon, is a South Korean singer, dancer and member of STAYC (스테이씨). She graduated from Gajaeul High School. She made her debut in November 2020 as the group's lead vocalist with their first single album, "Star To A Young Culture". They are managed by High Up Entertainment (하이업엔터테인먼트) and have enjoyed commercial success, especially with a big international fanbase.

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