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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://cdn.moviefone.com/image-assets/1666359/fsAVgRn8lIjFdweHpq6uODxhK8r.jpg?d=360x540&q=30)
![STAYC 1st World Tour [TEENFRESH] in Seoul](https://cdn.moviefone.com/image-assets/1446526/3QVbLW4FOW9xLg83CpDIIuoyyub.jpg?d=360x540&q=30)
