JUST B (저스트비, JUSTB) are a six-member boy group under Bluedot Entertainment. They debuted on June 30th, 2021 with their mini-album "Just Burn". The group consists of: Lim Jimin (임지민), Geonu (건우), Bain (배인), Siwoo (former JM /제이엠), DY (디와이), and Sangwoo (상우). DY and Bain are former participants of the survival reality competition series Under Nineteen, where DY took first place and debuted with a center position in a boy group 1THE9. Read more on Last.fm