Episode 1 S01 E01

Bada (as Vocal Trainer) Stephanie Kim (as Music Producer) Lee Soon-jae (as Principal) Kim Hee-chul (as Homeroom teacher) Lee Hae-in Natty Jo Yu-ri Jang Gyu-ri Lee Nagyung Lee Saerom Song Hayoung Park Jiwon Roh Jisun Lee Chaeyoung Baek Jiheon Lee Seoyeon Lee Young-yoo Joo Se-Bin 이시안

music competition audition k-pop idol group