Y:SY
South Korean singer (born 2000)
Y:SY
Lee Seo-yeon (Korean: 이서연, born January 22, 2000), also known as Y:SY, is a South Korean singer. She is best known as a former member of the girl group Fromis 9. Lee departed from the group in February 2025 after her contract with Pledis Entertainment expired in 2024. In 2025, she signed with H1ghr Music to start her career as a solo musician.
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