Jae-shin, who was banished from his world for committing the crime of messing with causality. There is only one way for him to return to the underworld, and that is to win over a human's heart. Appearing in front of Jae-shin, who doesn't believe in human emotions, is the Crown Prince, Nok, who is heartbroken from a long one-sided love. Jae-shin gets curious about Nok... "There it is. A foolish idiot whose affections are not returned."