The blunt and inflexible college student Kwon Jeong-ha absolutely despises Gwak Hyun-woo, his handsome and popular classmate who toyed with and then dumped the senior Jeong-ha had secretly been in love with.

The two are like cats and dogs — growling whenever they meet.

But one day, because of a strange necklace Jeong-ha picks up, their relationship is completely turned upside down.

“It’ll probably sound crazy, but… I’m a demon.”

Hyun-woo, who claims to be a demon, tells Jeong-ha that all the magical power he had stored inside the necklace has been absorbed by Jeong-ha — and that unless he gets it back, Jeong-ha will die.

The only way to return the magic… is through physical contact!
And so, Jeong-ha ends up living together with the demon.