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