Lee Minho is a straight 'A' student but that's the only straight thing about him. He seems cold at first glance but really he's a sweet and shy boy who's feeling a bit lonely. Minho's a third year university student studying at the National seoul university to be a cardiac surgeon. Han Jisung is the lively, energetic and cute new student at Minho's university. Jisung is an aspiring general surgeon. He might not seem smart but he really is, with a promising music career on the side, Jisung is ready to learn and get a good job. As both of them are in the surgical unit, they become roommates in a student lodging. As they get to know each other they will see what it truly means to fix someone's heart.