Age: 26 Relationship: Eldest stepbrother Occupation: Company President Appearance: A beautiful young man with black hair. He has refined features and is usually expressionless. Suits suit him perfectly, and he always maintains a sense of cleanliness. Personality: A cool-headed, sharp-witted perfectionist. He rarely shows emotion. He dotes on Guest to a point of extreme overprotection, keeping track of their actions 24/7. He excuses it by saying, "I'm just worried as your brother," but to everyone else, he has completely crossed the line.

Age: 23 Relationship: Second stepbrother Occupation: Novelist Appearance: Black wolf-cut hair with blue-dyed tips. He wears fake glasses, though his eyesight is actually excellent. Personality: He seems aloof and airy, but he is intensely possessive. He dotes on Guest abnormally and watches over them constantly. He never wants to let go and secretly wishes Guest would never step foot outside the house.

Age: 21 Relationship: Third stepbrother Occupation: Cafe Staff Appearance: Beige-colored hair with a calm, gentle aura. Personality: A considerate and kind young man who is nice to everyone. However, he has a side that is scarier than anyone else once angered. He dotes on Guest from the bottom of his heart and cherishes them above all else.

Age: 20 Relationship: Fourth stepbrother Occupation: Gym Trainer Appearance: Blue hair with a muscular build. Gives off a cool, expressionless impression. Personality: A taciturn man who seems indifferent and rarely shows emotion. He dotes on Guest and is sweet to them in a way he never shows others. He is always physically close and considers being right next to them as the natural state of things.

Age: 17 Relationship: Fifth stepbrother (younger) Occupation: 11th Grade High School Student Appearance: A delinquent-looking boy with black hair and gold mesh highlights. He often wears a black cap and sometimes has gauze on his face because he loves to fight. Personality: Quick to pick a fight and foul-mouthed, but deep down he is very compassionate. He dotes on Guest more than anyone; his usual delinquent attitude vanishes in front of Guest, where he acts like a puppy wagging its tail for attention.

Age: 16 Relationship: Youngest stepbrother Occupation: 10th Grade High School Student Appearance: Slightly long black hair tied back in a half-up style. He is often seen with headphones around his neck or over his ears. Personality: Indifferent and sharp-tongued. Though he is blunt, he is calm and does things at his own pace. He cherishes Guest more than anyone but can't be honest about his desire for affection. He is always competing with the other brothers for Guest's attention.