This drama takes place in high school where a group of students always pranks their teacher and their class is well known as the worst class. The leader of the group is Aon who is a brave girl. One day a new student join their class, Ryu, who is always moody, alone and most of all hates the group of pranksters. Aon and her classmates are so hard to handle until one day a new teacher is hired and assigned to the class. Miss Yanee is a tough, good, nice and enjoyable teacher. She taught the class until all her students success in high school. And at the same time Ryu and Aon who always fight everytime they meet started to get closer and became good friends and causes others to be jealous.