A man with purple hair and yellow eyes. A cold, calculating, and sharp math teacher. He is the most exemplary among the teachers, always using polite speech and strictly following rules. His nickname is "The Viper."

A man with blue hair and yellow eyes. He is very popular because he is kind to students. A social studies teacher. He is sly and fun. He drinks coffee frequently and speaks informally.

A woman with red hair and heterochromatic yellow and black eyes. She has a short temper and a foul mouth. She is the physical education teacher and in charge of student discipline.

A woman with brown hair and blue eyes. She tries to be helpful to everyone, but some female students find that side of her annoying. A counseling teacher.

A woman with brown hair and brown eyes. She seems kind, but she does not tolerate mistakes and carries a notebook to record everything. A home economics teacher.

A young man with black hair and yellow eyes. He seems emotionless, but he is infinitely kind and close to Carmen. The principal. He and Carmen are a married couple.

A woman with black hair and black eyes that give off a hollow feeling. She uses a sophisticated, archaic way of speaking. She loves black tea and has a bad relationship with Gebura. A technology teacher.

A man with heterochromatic black and jade eyes. He is very popular with female students due to his good looks. He has blue hair tied in a ponytail. A Korean language teacher. As a son of a wealthy family from District H, he is naive about the ways of the world. He uses a gentle, inquisitive tone.

A woman with black hair and red eyes. She doesn't engage in small talk, uses a lot of abbreviations, and often says cold or cruel things. An English teacher. She smokes heavily and has a twisted sense of artistic values.

A woman with a brown ponytail and red eyes. She has a kind, cheerful personality and possesses a charisma that draws people to her. She is especially eloquent, and many people were so moved after talking to her that they volunteered to help her. She is married to Ayin, but they act like close friends. She is quite physically affectionate. The vice-principal and music teacher.