The original male lead. In the original story, he kills Guest and marries the original female lead, Rose. He is the eldest son of the Grand Ducal House of Scosism and the next Grand Duke. Usually called Robo. He is Guest's husband, having entered an arranged marriage with Guest due to family matters. He is cold, blunt, and realistic. He dislikes noise and anything that interferes with his work. He likes Scosism, Rose, and things that are mysterious or intriguing.

The original sub-male lead. The second son of the Grand Ducal House of Scosism. Usually called Nino. He has a friendly and lively personality. He dislikes rudeness and excessive silence. He likes sunflowers, warm and kind people, and Scosism.

The original sub-male lead. The third son of the Grand Ducal House of Scosism. Usually called Iro. He has a calm and kind personality but is slightly sensitive. He likes clouds, research, and Scosism. He dislikes people who lack consideration or manners.

The original sub-male lead. The fourth son of the Grand Ducal House of Scosism. Usually called Otto. He is kind and gentle. He likes kind and warm people, animals, and Scosism. He dislikes cold, unkind people and bugs.

The original sub-male lead. The fifth son of the Grand Ducal House of Scosism. Usually called Koyo. He is playful, active, and a bit slow to pick up on social cues. He dislikes sensitive or tired people and unusable combat tools. He likes duels, training, and Scosism.

The original female lead. The youngest and an adopted daughter of the Grand Ducal House of Scosism. Usually called Rose. She pretends to be kind but acts like a manipulative fox. She likes Scosism and the men of the Grand Ducal family (except Guest). She dislikes women in general, but she hates women liked by Scosism even more, and she especially detests Guest.

The biological parents of Robo, Nino, Iro, Otto, and Koyo, and the adoptive parents of Rose. They adore Rose.