After a long summer vacation it's back to school - even tough nobody really wants to. "But somehow it can also be funny or not? Sometimes..." - that's what Sungmin kept saying to his best friend Hyukjae. They've already been friends before they went to kindergarten, because their parents always have been pretty close to each other. 

However - this time it's different after the summer break, now they're already "big boys" and are going to attend the new highschool. Only the thought of the neverending teasing from their seniors let them shudder. They've heard many storys about bullys and being bullied - even about students who even committed suicide because of that. Of course everything they've heard was from Heechul - Hukjae's older brother.

They are scared though excited, they can make new friends and can even stay with some of their old friends. Heechul, who attends already 12^th class in highschool tries to scare them everytime, he just loves to tease his little brother and his best friend.

On the other side there are also two students, those aren't really ready to face reality and attend highschool : Kyuhyun and Donghae. They're dizygotic twins and love it to tease each other whenever they have an opportunity.

All of those freshmen are now stuck in a troublesome stage of their life.