B1A4 (Korean: 비원에이포) is a five member South Korean boy band founded by WM Entertainment in 2011. The band consists of Jinyoung (leader), Baro (Sunwoo), Sandeul (Junghwan), CNU (Shin Dongwoo),and Gongchan (maknae/youngest). They were introduced in webtoon and mix pop with rock for their debut album. Their group name, B1A4, has been explained as being due to one member having B blood type, and the other four having A blood type. It also stands for "Be The One, All For One".