JUST B (저스트비) is a six-member South Korean boy group under Bluedot Entertainment, consisting of GEONU, BAIN, LIM JIMIN, SIWOO, DY and SANGWOO. They debuted June 30, 2021 with the mini-album JUST BURN and its energetic title track DAMAGE, produced by BANG YONGGUK.

Several members had well-developed individual careers before the group’s debut. GEONU and SIWOO (then known as JM) participated in I-LAND, while DY had performed with 1THE9 and BAIN participated in Under Nineteen. LIM JIMIN had already released two solo projects in 2019; he is properly classified as a solo artist as well as the group’s leader.

JUST B’s music includes the urgent dance drive of DAMAGE, the conceptual confidence of Tick Tock, RE=LOAD and ME=, and the alternative-leaning sound of MEDUSA. The group has participated in overseas touring and newer performance releases such as CHEST, gaining a following known as ONLY B.

As of October 2026 the team continues with six members. Its 2026 fifth anniversary was marked with an official fan event reflecting on shared memories from the U.S. tour. This profile distinguishes confirmed past releases from upcoming music that has not yet been formally dated.