Seo Soojin (서수진; born March 9th, 1998), known mononymously as SOOJIN (Hangul: 수진; Katakana: スジン), is a South Korean singer under BRD Entertainment, previously under CUBE Entertainment. She debuted as a sub rapper, sub-vocalist and the main dancer of i-dle (아이들) on May 2, 2018. On August 14, 2021 she was removed from the group following an alleged bullying controversy.
Two years later, she made her debut as soloist with the EP AGASSY on November 8, 2023. .
