A brand new survival that 'builds up' the ultimate vocal boy group.
Season 1
Lee Da-hee
Self - MC
Kim Jae-hwan
Self - Judge
Lee Seok-hoon
Solar
Baekho
Wendy
Seo Eun-kwang
Kim Seung-hun
Self - Contestant
Jeong In-seong
Jeon Woong
Yeo One
Im Joon-hyeok