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.
Shin Hye-jeong
Self - Contestant
12 episodes
Im Do-hwa
Self - Contestant
12 episodes
Cho Mi-yeon
Self - Contestant
12 episodes
Minnie
Self - Contestant
12 episodes
Song Yuqi
Self - Contestant
12 episodes
Lee Da-hee
Self - Host
10 episodes
Jang Sung-kyu
Self - Host
10 episodes
Park Bom
Self - Contestant
10 episodes
Shin Ji-min
Self - Contestant
10 episodes
Seo Yu-na
Self - Contestant
10 episodes
Brooklyn Nine-Nine
