Kim Heechul, being the Head Teacher at the same time principal of both exclusive school, Xavier Boy High and Xavier Girl High; she decided to combined the both school. Well, she reasoned out to everyone that her reason of doing that because of the financial problem which is not true. Of course, the owner of the both school is god-damn RICH. 

After combining the two school or not, the term for Heechul is transferring the girl student from Xavier Girl High to Xavier Boy High, which is already known for XAVIER HIGH. But there something that the faculty of the said school got shocked because there is three girl students that are going to transferred at a certain classroom named, CLASS 4-6. How come they ended in that classroom, well it’s one of the Heechul’s plan.

CLASS 4-6? The classroom that everyone is scared of. Who wouldn’t? Bunch of worst students and troublemakers are belong to that classroom. And having a class president named LEE DONGHAE. 

Is Heechul plan is going to be successful? Or it would cause more trouble especially to the new girl students of Class 4-6?