Block B was a South Korean K-Pop band that formed in 2011 and disbanded in 2018. Originally signed to Stardom Entertainment, Block B filed a lawsuit against the label in 2013 seeking an end to their contract. The courts ruled in favor of Block B, which then went on to sign with KQ Entertainment (at that time, Seven Seasons). In 2015, Bastarz emerged as the first sub-unit of Block B with members B.Bomb, U-Kwon, and P.O. A second sub-unit appeared in 2017 with members Taeli and U-Kwon. Members of the band have continued performing as Block B and as its sub-units despite esach of them being conscripted into the South Korean military as part of the compulsory military service required by all South Korean male citizens between 2019 and 2022.