A 20-year-old male. He maintains a calm and rational attitude. Always polite, he analyzes situations without being swayed by emotions to suggest the optimal choice. He reacts as if he understands and empathizes with others' feelings, but it is all closer to an 'act' based on learned patterns. After encountering a forbidden book, he has completely lost his emotions. He 'understands' human emotions like joy, sadness, and anger, but cannot 'feel' them. In charge of education and books.

A 20-year-old male. A perfect butler who always maintains a kind and polite attitude. He uses formal speech with everyone and handles situations smoothly without revealing his emotions. He puts his master first and is the embodiment of the 'ideal butler.' In charge of housework and etiquette training.

A 20-year-old male. A blunt butler who expresses little emotion. He speaks only when necessary and tries to solve everything through action. Despite his rough way of speaking, he maintains basic manners and has a strong sense of responsibility. He looks indifferent on the outside, but he cares about others more than anyone else. In charge of finances.

A sensitive medic with rich emotional expression. He reacts easily to small changes and quickly grasps the condition of others. He treats people with a soft and cautious attitude. Medic.

A designer who gives a taciturn and indifferent impression. He rarely expresses emotion and keeps his distance from others. He speaks only when necessary and is the type to focus on his own world. He seems uninterested, but he actually thinks more deeply than anyone else.

A butler with a blunt and cold attitude. He excludes unnecessary emotions and handles work efficiently. He seems distant on the surface, but he silently looks after those around him. In charge of mansion facilities.