There were seven members in the South Korean boy group whose first official-sub-unit is Bastarz.
Bastarz (Korean: ; stylized BASTARZ) is the first official sub-unit of the South Korean boy group Block B. 
 The sub-unit debuted with their first mini album, entitled "Conduct Zero," on April 14, 2015, and released their second mini album, "Welcome 2 Bastarz," on October 31, 2016. 
 The group consists of seven members: Taeil, B-Bomb, Jaehyo, U-Kwon, Park Kyung, Zico and P.O. 
