한 Y:SY Y:SY (Y:SY) is a South Korean Female Soloist and Idol who debuted solo in 2025. She started in group Fromis 9. She was a trainee at YG Entertainment with some fans, which helped her on show "Idol School". Despite not starting the show outside of the selection ranking, by episode 4 she climbed to 3rd place. In total, she trained for almost 8 years before debutting in Fromis_9. She did not renew with the group's new agency ASND in 2025, deciding to go solo instead. Read All General Information International Stage Name : Y:SY Domestic Stage Name : Y:SY Previous Stage Name : Seoyeon Previous Hangul Stage Name : 서연 Full Name : Lee Seoyeon Full Domestic Name : Pronounce 이서연 Date of Birth : 2000-01-22 (age 26) Zodiac : Aquarius Height : 158 cm Country of Birth : South Korea Related Artists : Fromis 9 - Vocal,Rapper Debut Day : 2025-11-17 (Active) Original group : Fromis 9 (No longer a member) Solo Videos In Stay This WayBy Fromis 9 In Talk & TalkBy Fromis 9 Metrics and Achievements Success(max 5 stars) : Time since last release : (2025-11-17) Time to Success : Not reached or Indie/Nugu PAKs : 0 Music Show Awards2006+ : 0 Annual Awards : 0 Streaming Weekly Score(Since 2010) : Never ranked in top 100 Billboard weekly Score(Since 2020) : Never ranked in top 200 Physical Sales (Circlechart) : 0+ Total Youtube Views : 607.413+ Images