Cast (20)
BadaSelf - Vocal Trainer
Stephanie KimSelf - Music Producer
Lee Soon-jaeSelf - Principal
Kim Hee-chulSelf - Homeroom Teacher
Lee Hae-inSelf - Contestant
NattySelf - Contestant
Jo Yu-riSelf - Contestant
Jang Gyu-riSelf - Contestant
Lee Na-gyungSelf - Contestant
Lee Sae-romSelf - Contestant
Song HayoungSelf - Contestant
Park JiwonSelf - Contestant
Roh JisunSelf - Contestant
Lee ChaeyoungSelf - Contestant
Baek JiheonSelf - Contestant
Lee Seo-yeonSelf - Contestant
Lee Young-yooSelf - Contestant
Joo Se-BinSelf - Contestant
Lee Si-anSelf - Contestant
Herin SeoSelf - Contestant