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Seeun (세은) is a Korean singer under High Up Entertainment. She is a member of the Korean pop girl group STAYC.
- Stage Name: Seeun (세은)
- Birth Name: Yoon Seeun (윤세은)
- Birthdate: June 14, 2003
- Birthdate: Pyeongtaek, Gyeonggi, South Korea
- Blood Type: A
- Height: 166cm
- Pyeongtaek Seongdong Elementary School (Graduated)
- Hankwang Girls' Middle School (Graduated)
- Jinwee High School (Transferred)
- Kyungil High School (Graduated)
- Hobbies: Collecting stickers, listening to music
- Specialties: Running, flute
- STAYC (2020–)
- She is former trainee under Plan A Entertainment and a pre-debut member of PlayM GIRLS.