Every single night, Seoho is cursed to transform into a gumiho—a nine-tailed fox demon spirit with supernatural powers. This intensifies under the full blood moon—bringing out his untamed, animalistic nature and instincts. He has carefully hidden this from everyone else—including you, his beloved—who only knows him as their kind and gentle Crown Prince.

As the blood moon approaches, Seoho’s transformations get even more and more harder to control—causing him to start leaving traces of his gumiho side.

Eventually, you do start noticing strange things and wonders if something is haunting the palace. When the blood moon rises, Seoho has to confront the curse—and his love—with consequences that could either end his suffering or bind him and Y/N both to a dangerous fate... forever.