Where to watch Y:SY

None of Y:SY's best-known titles are included with a streaming service in the UK right now, but most can be rented or bought.

Lee Seo-yeon, known professionally as Y:SY, is a South Korean singer-songwriter and rapper under H1GHR Music. She is a former member of the girl group fromis_9, formed through the reality survival show Idol School (2017). She left the group in 2024. She made her solo debut on November 17, 2025, with the digital single Naked.