Leeteuk, Hankyung, Siwon and Kyuhyun are the popular boys of SJ Academy, they're also the popular band named Super Junior IV but their identity are unknown to the people. A new girl transferred to SJ and later transformed into a fangirl after watching SJ's performances, she hated Leeteuk's group in school but she didn't know that those people are her favorite band.  A new boy group will appear and difficult challenges will occur.

Park Jung Soo/Leeteuk/Dennis Park: 17,Rich kid, most handsome popular guy in school, has a cocky yet smart personality, keeps his family dilemma to himself, he has a half-brother whom he hasn't meet yet, he keeps his feelings for (you). he shows a lot of care for the people he loves.

Lee Hyuk Jae/Eunhyuk: 17, lives by himself in a penthouse which is unknown to the people around him except Kibum. He doesn't know his father and his mother died while giving birth to him, but he has a mysterious sponsor in all his financial needs. he has a rough personality and has a bad boy image, he looks tough outside but actually soft inside.

Kim Kibum: 17, he is Eunhyuk's bestfriend, and know EVERYTHING about eunhyuk, though eunhyuk always bullies him, he's still loyal and kind to him. he always helps eunhyuk when he is in trouble. at first eunhyuk didn't accept him as a friend but later on accepts him.

Cho Kyuhyun/Marcus Cho, Choi Siwon/Andrew Choi, Park Hankyung/Joshua Tan: 17, good looking men, rich kids has cocky personalities except for siwon who is a bit gentleman compared to kyuhyun and hankyung. They are Leeteuks friends since kindergarten.

You, (Um Haerim) 17, has a good family, has one brother abroad, from a middle class family, has a strong personality and very witty.