Lee Taemin and Harry Styles hate each other since God knows when. The problem is that they have to get married for family business. What will happen when they learn about the news? When this strange guy joins Taemin's school? A lot of questions will be answered, but what will happen about the others?

JongHyun is a college student struggling to live on his own and keep up with his studies. When he meets Key in a chance encounter he thinks that there's no one more annoying than him. However, after finding Key beatened badly on a return trip to the store things get a little more intimate than JongHyun planned. Next thing he knows, he's got a job, his best friend is on the verge of dying and a suspicious friend is acting well.... Quite suspiciously. How will things turn out as friendships are tested and feelings are strengthened for the one person you thought you hated more than anything in the world?