Moon Seo Yoon, known professionally as Annie, is a South Korean singer, dancer, and member of ALLDAY PROJECT (올데이프로젝트). She was born in South Korea but moved to the United States, where she graduated from The Chapin School in New York. She was enrolled at Columbia University before taking a leave of absence to pursue her career as a singer.

She became a trainee for THEBLACKLABEL (더블랙레이블) and was part of the pre-debut lineup for MEOVV but was not chosen to debut with them. She remained in training and was picked by rapper and producer Teddy as part of the new co-ed group he was forming.

She made her debut in June 2025 as ALLDAY PROJECT's rapper with their first single album, "Famous".

(Source: MyDramaList) Edit Biography