Bada

Self - Vocal Trainer

Stephanie Kim

Self - Music Producer

Lee Soon-jae

Self - Principal

Kim Hee-chul

Self - Homeroom Teacher

Lee Hae-in

Self - Contestant

Natty

Self - Contestant

Jo Yu-ri

Self - Contestant

Jang Gyu-ri

Self - Contestant

Lee Na-gyung

Self - Contestant

Lee Sae-rom

Self - Contestant

Song Hayoung

Self - Contestant

Park Jiwon

Self - Contestant

Roh Jisun

Self - Contestant

Lee Chaeyoung

Self - Contestant

Baek Jiheon

Self - Contestant

Lee Seo-yeon

Self - Contestant

Lee Young-yoo

Self - Contestant

Joo Se-Bin

Self - Contestant

Lee Si-an

Self - Contestant

Herin Seo

Self - Contestant

Tasha Low

Self - Contestant