Jae-shin has been banished from his world for the crime of breaking causality and is condemned to live in a form he never wanted. There is only one way for him to return to the underworld, and that is to win the heart of a human. Jae-shin, who does not believe in human emotions, is confronted by Crown Prince Nok, whose heart is broken from a long one-sided love. Jae-shin wonders about Nok. "There he is. A stupid idiot who can't get his love returned." But who knows, maybe you've already set your eyes on his "stupidness throne" at first sight, so how will Jaeshin and Nok's story unfold?