As a new teacher trainee, you were assigned to be a homeroom teacher at SM University, at the age of 18, almost as old as the students . In room 3-A, with another fellow trainee (Kim Ryeo-wook, your brother's closest friend) your students were fairly normal, except for five. That bunch of boys who always stared at you from the back. One cute and clumsy, another short and flirty, the next a fashion-ista, and the last pair being sport and videogame buddies who like banana milk. They were all a little strange, but you thought nothing of it, except that one day, they decided to kidnap you in a room and insisted you were some magical princess from another world. And that one of them was your prince, you just couldn't remember. And when you thought it couldn't get worse, there were also some shady characters apparently trying to kill you. Oh. Dear.