Seventeen has thirteen members; which is futhermore divied into 3 sub-unitsː Vocal unit [Woozi, Jeonghan, Joshua, DK and Seungkwan], Hip-hop unit [S.Coups, Wonwoo, Mingyu and Vernon] and lastly, Performance unit [Hoshi, Jun, The8 and Dino] hence the name 'Seventeen', because 13 members and 3 sub-units in 1 group.