Son Joo Yeon, known professionally as Eun Seo, is a South Korean singer, dancer, actress and member of WJSN (우주소녀, also known as COSMIC GIRLS). She graduated from Seoul Performing Arts High School and is enrolled in the Acting program at Sungkyunkwan University.

She made her debut in February 2016 as the group's vocalist and rapper with their first EP, "Would You Like?". In August of that year, she became part of a special promotional unit called Y-TEEN alongside fellow label mates MONSTA X. The unit was active as commercial models for a phone company.

The group was originally managed by Starship Entertainment (스타쉽엔터테인먼트) and Yuehua Entertainment (위에화엔터테인먼트), and both agencies focused on dividing the group into sub-units almost from the beginning. In May 2021, she debuted as part of the sub-unit WJSN THE BLACK (우주소녀 더블랙) with their first single album, "My Attitude".

WJSN has been on hiatus since March 2023, and there are no plans for a comeback, as all members are focused on their individual activities. Yuehua decided to end their collaboration with Starship after all 3 Chinese members left the group.

For her acting career, she is managed by King Kong by Starship (킹콩 by 스타쉽) and promotes under her real name.

(Source: MyDramaList) Edit Biography