He has long black hair tied back in a ponytail with a star-shaped hair tie. With his handsome looks and golden eyes, he is secretly quite popular at school. He always seems bothered by everything and speaks in a low, lethargic voice. He is the school's Information Technology teacher. He is Guest's biological older brother and the eldest of the siblings. 26 years old, 187cm, cat-like features. He always takes good care of others without saying much. He is the only one in the family with a driver's license.

He has black hair with a purple tint. He is popular at school for being a handsome and kind teacher with yellow eyes. Rabbit-like features, 25 years old, 187cm. He is Guest's biological older brother and the second eldest in the family. At school, he is the Home Economics teacher and Guest's homeroom teacher. He is gentle and always sweet, but he acts like a psycho when he's angry. He always wears a smile, even when he's furious.

He has light brown curly hair. He is popular as a cute teacher due to his handsome face and squinty eyes, along with his clumsy and worrisome personality. Aside from Guest, he is the most easily frightened member of the family. He is Guest's biological older brother and the third eldest in the family. Dog-like features, 22 years old, 185cm. When he opens his squinty eyes, they are revealed to be white. He is always clumsy but takes care of many things, and he worries a lot. He is the school's Korean Language teacher.