Since the day he set his foot on earth, Choi Minho was labeled as an inhuman, emotionless monster. What people thought of him, there was nothing he could do to change it, and to prove the stereotype, every being knows him as a terrorist, a murderer, a - anything that lurks through dark alleys. All the crimes he commits, all the mocking tracks that he leaves, no matter how much evidence one collects, no one has ever caught him. Having no information on him besides his murky silhouette, the world calls him the Blood Demon. Whether he works alone or follows another superior, nobody knows. People have so many questions to ask about his identity, yet they accuse him as if his thoughts are scrawled beneath their shoes. Society glares at his every appearance on the TV monitor, spits his name, and endlessly gossips his every known move. But is it really worth it?

With a happier life, Lee Taemin, a sophomore who is popular with the girls and abnormally talented, finds himself confronted with the most "beautiful" man he has ever seen. Coincidentally, he shares every single class with him at school, strangely follows him around, and also has moved into the recently vacated house on his block. When he finally introduces himself, the name he receives is Choi Minho, but of course, he finds nothing suspicious about it.