JBJ Members Profile: JBJ Facts. JBJ (제이비제이), an acronym for ‘Just Be Joyful’, is a 6-member South Korean boy group under Fave/LOEN Entertainment. The group consists of Taehyun, Kenta, Sanggyun, Longguo, Hyunbin, and Donghan. JBJ was a fan project group who previously participated in Produce 101 Season 2.