A musical battle between 6 trending girl group acts, in order to "determine the real number one" when all 6 release their songs at the same time.
Taeyeon
Main Host
Lee Yong-jin
Self - Queen Manager
Hyolyn
Self - Contestant
Min Young
Yu Jeong
Eun Ji
Lee Yuna
Eunha
SinB
Umji
Seola
Bona
