Lee Geon Woo, known professionally as Geonu, is a South Korean singer, dancer and member of JUST B (저스트비). He attended Jungil High School but dropped out and later passed the High School Qualification Examination. He is currently enrolled in the Broadcasting Entertainment program at Global Cyber University.
Before debuting, he appeared in "I-Land" and spent one year and four months as a trainee at Bluedot Entertainment (블루닷엔터테인먼트).
He made his debut in June 2021 with the group's first mini-album "Just Burn".
In September 2024, JUST B will join ATBO to form a special project group called THE CREW ONE (더크루원) to participate in the survival show "Road to Kingdom Season 2".