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Choi Yujin
1. Nightmare Teacher
Chun Yoona - (Ep 10)
2. Green Fever
Yujin - Yujin is popular at school for being an idol trainee.
3. So Not Worth It
Han Hyuna - Han Hyunmin's sister who suddenly shows up at his college to visit. (Eps 9-10)
4. Pumpkin Time
Han Suzy/Sooji - A transfer student who has a crush on Kang Taejoo. She’s very clingy and follows him around, which leads to her becoming envious of Shin Haeyoon.
5. Her Bucket List
Saehyun - A trainee who is about to debut. (Ep 4)
6. Untitled Unknown Unmastered (UUU) ♫
Seo Doah - A cheerful high school girl who is the bassist of the band “GreenU’s”. She is the band’s leader with 2 of her friends as bandmates.
Oh Seunghee
1. T.O.H. Ding Dong Challenge
Haeyul - A highschooler who wishes to have 1million subscribers on youtube.
2. Ditto
Student at the tteokbokki restaurant
3. Loan Boy
Yeji - A popular highschool delinquent.
4. Hierarchy
Secretary Kim - Secretary to Rian, the heir of Jooshin group.
5. I Love You Bit By Bit
Sergeant Choi - A sergeant in the NCO who is a year older than Jeong Min. She can be a little jealous that Jeong Min is popular among guys.
Jang Yeeun
1. T.O.H. Ding Dong Challenge
Bora
Chang Seungyeon
1. T.O.H. Ding Dong Challenge
Yeongbi - A highschooler who aspires to be trainee.
2. Her Bucket List
Minyoung - A trainee who is about to debut. (Ep 4)