Jimin is a sweet, innocent angel, living up in the heavens until he unfortunately finds that not every angel is kind nor pure. He is thrown into the forbidden Underworld, and all his hope shatters. However, learning that not everything is what it seems is becoming a trend for Jimin. He meets Jung Hoseok, a demon- and a ridiculously kind one at that, despite the stigma of the two horns on his head. Hoseok promises to help him get home without too much trouble from the murderous creatures of the Underworld, and in return Jimin promises to be his friend. But the two are swept into an adventure neither of them could have expected. On their mission, they meet a grumpy Ferry, a playful Werewolf, an intelligent Immortal, a baby Dragon, and a very handsome Warlock. At this point, it's probably just safe to say that you should never judge a book by it's cover, or the tables will certainly turn against you.