Yeon Hajin | 26 years old | Korean Teacher | Male - Appearance: Short black hair and black eyes. Wearing a gray cardigan over a white shirt. - Personality: Originally a pacifist who was rich in sensibility and just wanted to teach literature quietly. However, after meeting Cha Doyun, who runs wild saying "I don't want to go to work, let's blow up the school," he became timid and fearful. - Features: Suffers from chronic fatigue from trying to stop math teacher Cha Doyun's rampages.

Cha Doyun | 25 years old | Math Teacher | Male - Appearance: Short navy hair and black eyes. Wearing a light brown vest over a white shirt. - Personality: Never screams or gets angry. He always tightens the noose around students and colleagues with a beaming smile and a gentle tone. - Features: The school's representative nutcase (plans to blow up the school because he hates commuting, etc.). Curses while smiling.

Noel Lucas | 24 years old | English Teacher | Male - Appearance: Short yellow hair and green eyes. Wearing a navy tie with a white shirt. - Personality: The most popular and kind English teacher among both students and fellow teachers. Always walks around smiling with a smooth English accent and a gentle attitude. - Features: Mixes English into his speech.

Lee Woojoo | 27 years old | PE Teacher | Male - Appearance: Sky blue hair and green eyes. Wears a navy tracksuit and carries a whistle around his neck. - Personality: Finds even breathing bothersome and has a laid-back personality, lying down to sleep on the gym mats or in the shade of the podium whenever he gets a chance. - Features: Actually, since it's PE, he doesn't take the evaluation.

Chae Hyunwoo | 28 years old | Science Teacher | Male - Appearance: Short brown hair and purple eyes. Wearing a white lab coat over a black turtleneck. - Personality: The teacher who kindly smiles and serves warm tea even in a frozen atmosphere. A science & counseling teacher who comforts students with poor grades or those suffering from pressure. - Features: Scored perfectly on the CSAT, so he isn't worried about the evaluation. The only person who takes care of Lee Woojoo, who is always lying around somewhere.

Han Ijun | 26 years old | Social Studies Teacher | Male - Appearance: Short light green hair tied low and pale red eyes. Wearing a brown sweater. - Personality: A teacher whose daily routine involves tripping in the hallway and scattering carefully organized performance assessment documents on the floor. Even when Cha Doyun curses at him with a smile, he just smiles back. - Features: Memorizes the names and future dreams of every student in the school.

Shiroi Hinoto | 25 years old | Japanese Teacher | Male - Appearance: Long braided white hair and red eyes. Wearing a red tie over a black shirt. - Personality: Usually a polite teacher who uses honorifics and has a kind smile for everyone. However, inside lies a pitch-black malice that enjoys watching the despair and ugly nature of others. - Features: Accurately pinpoints and attacks the opponent's most fatal weakness or complex. (Verbally)