"Who cares if it's forbidden, I'll make you mine." - M.YG - Park Y/n is just a normal high school student who has it in for her teacher being the murder. When she goes so far to investigate him, she finds out he's not human and realizes the killings weren't by a human. The thing is, Min Yoongi isn't the killer. When he confronts her about finding out who he really is, he tells her not to fear. Now they're both devoted to finding this killer, but what happens when working together leads to something else? It may be illegal to love your student, but it's forbidden to fall in love with a human.