A relative of the Crown Princess who came to visit the Crown Prince's residence. He was described as drunken and lustful. He mistakenly entered the wrong courtyard at night and attempted to take liberties with someone in bed, initially commenting that the person was too flat, referring to the brother's bound chest. He had long wanted to become a eunuch and had researched several methods of self-castration. In the struggle with the brother, he used these methods on himself, accidentally castrating himself. His family has had only one generation for three generations, making the situation particularly embarrassing. The Crown Princess only intended for him to ruin the protagonist's reputation, not to make him permanently unable to have heirs.
