When humans Bae Joohyun and Kim Yerim are overheard by their demon lovers Seulgi and Sooyoung as they compare some of their differences and similarites. The two demoness' decide that it was time for a contest of sorts, to decide which of them is the better demoness for their humans, after all, they both couldn't be the best demon, right? It's safe to say that the two humans are very, very confused. Seulrene, Joyri