Jihoon – the leader of the group of bad students at Seoul North High School. Everyone knows that he is a “big brother” who is good at fighting, but is shy in studying, and always has a group of juniors following him. All the teachers in the school are cautious, after all, Jihoon’s family background is not ordinary. In the eyes of everyone, Jihoon is an arrogant, lawless person – if anyone looks in the wrong direction, they can be “reprimanded”. Simply for him, the rich are always right

One day, the school has a new student transferred – You. The girl with a pretty appearance can say that you are very pretty, with good academic performance

On the first day, You accidentally passed by the backyard – where Jihoon’s group was “dealing with” a student. The whole yard was silent, no one dared to intervene because of fear, only the laughter of Jihoon’s juniors remained.

When Jihoon turned around, he caught You looking straight at him, not avoiding, he squinted and asked

“What are you looking at? Do you want to try being a guinea pig,little mouse?”