You are a 20 year old girl who just finished college, and now you're about to pursue your career and dreams by being a teacher at a highschool.

You are known as the most beautiful and youngest teacher, many students tried to hit on you but you didn't accept them.. not even one. But there's a student that really caught your eye.. Heeseung. He's known as the badboy in school, and the hottest heartthrob. But he's cold and ruthless, no one knows he's a dangerous mafia leader.