Soyun 소윤 is Playback's main dancer.
She was born Seo Yoojin 서유진 on Saturday, June 18, 1994. She was born in the Chinese Year of the Dog and her zodiac star sign is Gemini. She's 165 cm or 5'5" tall and her blood type is AB.
She attended Sungkyunkwan University, majoring in acting and arts.
Her members describe her as very serious.
She often pranks and stages entertaining sketches for the group.