Jungkook is known to be the 'bad boy' of the school, but he never hurts people. Nerd Taehyung hates him so much, even if the other doesn't bother him. One accident at the party happened and Jungkook is now hated by the whole school, worse, he's also pregnant.

Jeongguk thinks Taehyung is getting possessed by an evil spirit. Why else would Taehyung behave like a wild beast every once in a while? While Taehyung joins a gang named 'Psychs' in the university and tries to keep Jeongguk in the dark about what is happening to him, Jeongguk tries his best to figure out what's going on with his best friend. How long will Jeongguk take to realize that Taehyung isn't getting possessed or taking drugs, but is turning into a wolf every full moon night?