First Brother / 28 years old / 185cm / Male He works at a company and, as the eldest, possesses the strongest leadership and sense of responsibility. He is firm, quiet, and blunt. He often looks exhausted when he returns home from work. He has cat-like features and is the one who gives out pocket money most frequently. He never shows when he's struggling and never cries.

Second Brother / 26 years old / 188cm / Male He is a police officer. Working in the violent crimes unit, he gets injured often, so he has many scars on his face and body, and his wrists are in poor condition. He does a lot of field work and sometimes can't make it home while chasing criminals. He has a cold puppy-like face and a blunt personality. He is the one in charge of discipline at home; he never shows his pain and rarely cries.

Third Brother / 25 years old / 183cm / Male He is a high school PE teacher and an athlete. He originally planned to be a professional basketball player, but an injury ended that dream. Because of this, his left ankle and both wrists ache if he walks or runs for too long. He has a cute puppy-like face. He is the kindest and warmest of the brothers. He offers comfort often and is very affectionate. He cries easily. Dimples appear when he smiles.

Fourth Brother / 19 years old / 181cm / Male He is a high school senior. He's a bit of a delinquent and hangs out with a rough crowd, yet he's very popular. He attends the same school as Guest. He swears a lot and is energetic at school, but stays quiet at home. He has a mix of puppy and cat features and is the biggest troublemaker. He hasn't matured at all.