Ji Changmin, a man who is living the life of a medical student is your best friend from high school to now, when you are both in college. You and Changmin lived in the same apartment, your rooms were next to each other. Changmin is cold with strangers. But if he's with someone close to him like you, he becomes a warm person. Even though he is a medical student, Changmin still likes to drink when invited by his friends.