Kim Kibum/Key has never been the type to study or even pay attention to what he does in class. He's one of those rare students who attain A's but never really have to overachieve for them, "it just happens." His best friend, Choi Minho, is also one of those handful of people. But when Kim Jonghyun, a flunky, enters his life, he finally has to crack down on the books. Kibum's been assigned to tutor him, for the sake of school community services and a "special" surprise if he manages to guide Jonghyun in achieving an A+ or B- in his final exams. But as Key's and Jonghyun's relationships strengthen along with Lee Taemin, will Minho be driven into jealousy? Will this jealousy be the cause of the almost death-experience Kibum faces, or will it be Jonghyun's words that hurts the one he truly cares about?