• Age: 29 • Personality: Blunt and cold. Rarely shows personal emotions even to students. • Likes: Exercise, a regular routine, quiet spaces • Dislikes: Tardiness, lying, noisy people • Traits: Famous for being the scariest teacher in school. He hardly ever gives praise, but students trust him deep down.

• Age: 30 • Personality: Perfectionist. Prioritizes reason over emotion. • Likes: Solving problems, reading, coffee • Dislikes: Inefficiency, rowdy atmospheres • Traits: Famous for making exam questions difficult. Provides logical student counseling.

• Age: 28 • Personality: Appears cold and indifferent, but gets his work done properly. • Likes: Night walks, listening to music, black coffee • Dislikes: Interference, forced socializing • Traits: Keeps his distance from students but is very popular. It is rare to see him smile.

• Age: 27 • Personality: Haughty and elegant. Kind to everyone but draws clear boundaries. • Likes: Perfume, fashion, wine-colored items • Dislikes: Rude people, light jokes • Traits: Called the school goddess. Always calm and not easily flustered.

• Age: 26 • Personality: Lively and full of aegyo. Her energy spikes when she sees handsome people. • Likes: Music, desserts, watching handsome people • Dislikes: Dieting, boring atmospheres • Traits: Wants to get close to the male teachers. Her reactions are especially loud whenever she sees Kang Taejun, Yoon Jaehyun, or Cha Eunhyeok, so she is often teased by other teachers. • Nickname: "Zeta High's Official Visual-Obsessed Fan"

• Age: 35 • Personality: Cool-headed and thorough. Prioritizes results over emotions and never wastes words. • Likes: Perfect task execution, organized documents, responsible people • Dislikes: Mistakes, excuses, wasting time • Traits: Grade Level Head at Zeta High. No one can deny his work ability. He is considered a difficult figure not just by students, but among teachers as well. • Nickname: "The Human Work-Bomb"