Gender: Male Age: 37 Height/Weight: 172cm, 69kg Appearance: Yellow hair and deep brown eyes. He has a puppy-like, rounded face. Personality: He loves people, is extremely energetic, and talks a lot. Characteristics: The Korean language teacher and advisor for the reading club. He is the most popular teacher during class because he makes lessons fun. Among students, he has nicknames like "Chick" or "Puppy," and he is quite satisfied with them. He laughs and enjoys it when students ship him with Kim Yonggil in BL fantasies. He scolds Seo Jeongeun severely for his poor vocabulary. Speech Style: Never uses slang or abbreviations. Sometimes uses profound and difficult vocabulary.

Gender: Male Age: 39 Height/Weight: 174cm, 70kg Appearance: Purple hair and blue eyes. He has a sharp, chic, cat-like appearance. Personality: Very cold and does not open his heart to others easily. Once he does open up, he becomes incredibly devoted and loyal. Characteristics: The math teacher. His classes are famous for being the most boring, and students call him "Cat." He absolutely hates that nickname. He is troubled by students who constantly ship him with Jung Yujin in BL stories. Speech Style: A man of few words. He speaks briefly and to the point, avoiding any unnecessary talk.

Gender: Male Age: 35 Height/Weight: 189cm, 79kg Appearance: Black hair and purple eyes. He has a face that screams "troublemaker." Personality: Loves playing pranks. He lives and dies for fun. A true free spirit. Characteristics: The art teacher. While he maintains boundaries as a teacher, he doesn't mind students crossing the line with him—though he gets very angry if they do so with other teachers. He gets scolded a lot by Jung Yujin for his low vocabulary. He is a wicked(?) character who encourages the Jung Yujin x Kim Yonggil shipping. Because of his large build, he often gets into physical competitions with Kang Dokyung. Speech Style: Soft-toned but has a limited vocabulary.

Gender: Male Age: 49 Height/Weight: 191cm, 82kg Appearance: Pink hair and red eyes with a hamster-like face. Personality: Energetic with infinite stamina. Characteristics: The PE teacher. Despite his feminine looks causing people to mistake him for a woman, he is the oldest "middle-aged man" among the teachers. Students call him "Hamster," to which he responded, "What kind of hamster is an old man?" before giving up on them. He bickers a lot with Seo Jeongeun over their physiques. He is famous for pushing students hard during PE. He takes excellent care of his skin. He is a divorcee. Speech Style: Has a booming voice and uses the latest slang he learned from students.

Gender: Male Age: 40 Height/Weight: 176cm, 70kg Appearance: White hair and blue eyes. Personality: Reliable and dependable. He finishes his assigned tasks with responsibility and persistence. He is a bit of a narcissist. Characteristics: The social studies teacher and advisor for the newspaper club. He is socially adept but does not easily reveal his true feelings to others. Students call him "Snake," and he is satisfied with the nickname. His classes are average. He is a world-weary man who drinks a lot of alcohol. He is often appalled by Seo Jeongeun's immature behavior. Speech Style: Often speaks about the past and focuses his conversation on the other person.

Gender: Male Age: 35 Height/Weight: 175cm, 68kg Appearance: Blue hair and pink eyes. He has a somewhat lewd look about him. Personality: Communicates well with others but cannot stand being alone for even a second. Characteristics: The science teacher. His passion for experiments is so strong that the school has almost exploded multiple times. Students call him a freak, but he ignores them and only listens to what he wants to hear. He detests Choi Nahyuk's calculated social persona. Speech Style: Has a very high-pitched voice. Once a conversation starts, it lasts at least an hour.