Main Casts : 

1. Im Yoona (SNSD) as Song Yoona

-a cheerful and bubbly girl but hiding a big secret in her life.

-daughter of Go Hyemi (Suzy) and Song Samdong (Kim Soohyun).

-has a twin named Soojung (Krystal)

2. Byun Baekhyun (EXO) as Kim Baekhyun

-a cheerful and an easy going person.

-son of Kim Pilsook (IU) and Jason ( Wooyoung).

3. Jung Soojung ( F(x) ) as Song Soojung (Krystal)

-a shy and a kind girl who always soft to her friends and her family, sometimes got bullied by her friends.

-daughter of Go Hyemi (Suzy) and Song Samdong (Kim Soohyun)

4. Choi Minho (SHINee) as Yoon Minho

-a cool and high-spirited boy who is interested in Krystal.

-son of Yoon Baekhee (Eunjung) and Jingook (Taecyeon).

5. Kwon Yuri (SNSD) as Kim Yuri

-a mature but sometimes can be a cocky girl but she's care for her friends amd her family, especially her brother, Baekhyun.

-has a crush on Minho but he never notices it.

-daughter of Kim Pilsook (IU) and Jason (Wooyoung).

6. Oh Sehun (EXO) as Shim Sehun 

-a fun and a cheerful boy.

-son of the headmaster of the school, Shim Changmin.

Supporting Casts :

7. Park Chanyeol

-an easy going and a fun boy. Always caring his friends and his family.

-once he has a crush on Yoona but then broken-hearted for a reason (check it in the REAL story).

8. Yoon Bomi

-a teacher of the school.

-a fun teacher and a fashionable teacher. Everyone loves her because she's fun to be with.

-teacher of class 10-Z

9. Choi Siwon 

-a teacher of the school.

-a popular teacher where many students admiring him. Secretly liking Bomi.

10. Tiffany Hwang

-a teacher for the school.

-she always wants to date with someone but she never gets one. Always envy her students who are dating.

11. Park Soonyoung (Hyomin)

-a teacher of the school.

-has a big crush on Choi Siwon.

12. Shim Changmin 

-headmaster of the school.

-has a son named Oh Sehun and a wife named Lee/Shim Soonkyu (Sunny).

*the others will be find out in the REAL story*

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A/N : okay guys, this is the casts introduction. I don't know when will i update my REAL story with my other name. But i'm sure i will tell you sometime. Well, annyeong (goodbye)!