Beomgyu is a scrappy commoner, the palace guard he falls in love with. Soobin is a prince, the second son of the king, destined to lead his father's military into war against foreign enemies. But for now, Soobin was living in a dream that he never wanted to end. He knew in the back of his head that this would have to end one day, that anything that might happen between a prince and a boy from the barracks would be doomed before it could begin. Soobin couldn’t have kissed him even if Beomgyu had begged him.
Imagine you’re Choi Soobin, who is just ultimately tired and would very much like to get through his last year of high school without starting a war between heaven and hell. You meet a very attractive boy who hunts demons for a living, discover that you are, in fact, half-demon and also that you are the determining factor for the fate of the mortal world as we know it. You walk away from it unscathed, but everything that follows after is a complete shitshow. Imagine you're Choi Soobin and you've lived seventeen perfectly ordinary years, until one day you have a near-death experience.