Lee Seo-yeon, known professionally as Y:SY, is a South Korean singer under H1GHR Music. She is a former member of the girl group fromis_9. On November 17, 2025, she made her solo debut with the digital single 'NAKED'.
| Episode |
리무진 서비스 fromis_9 LEE SEO YEON |
2023 |
| Episode |
엠넷 아시안 뮤직 어워드 Unknown |
2018 |
