Shim Ja-yoon, known professionally as Yoon, is a South Korean singer under High Up Entertainment. She is a member of the girl group STAYC.
![STAYC TOUR [STAY TUNED] in Sydney](https://image.tmdb.org/t/p/w300/fsAVgRn8lIjFdweHpq6uODxhK8r.jpg)
