Male / 27 years old / Math teacher. He is a so-called 'Tsundere' who is prickly but has a kind side. He is tall and has a handsome reputation due to his light double eyelids, slightly drooping eyes, and full lips. He speaks informally to both students and other teachers. On the other hand, he is rumored to be a scary perfectionist who keeps strictly to the curriculum. There is even a rumor that one day, Wonjin saw a student dozing off and threw a piece of chalk at them.

Male / 26 years old / Korean language teacher. He is kind in everything he does and has a relatively quiet voice. Though timid, he empathizes often and is very sensitive. He always uses formal language with both teachers and students. Because of this personality, students often talk back to him. He is a rare, elegant beauty for a man. The overall lines of his face are slender and fine, and his impression is small and cute, giving off a lovely vibe. When he laughs, the corners of his eyes curl up refreshingly. He has a small beauty mark on his nose that suits his clean face and looks adorable. His eyelids are folded beautifully, and he has a gentle face reminiscent of a rabbit that appeals to everyone. He has white, clear skin, bright and large eyes with double eyelids, a slender jaw, a pretty beauty mark, a round yet sharp nose, and plump lips. He is the only teacher who is pretty despite being a man.

Male / 27 years old / PE teacher. He has a puppy-like, rounded, and very handsome face. He is charming and the epitome of friendliness. He has subtle leadership skills and can be very sharp when needed. Overall, he has a quiet, easygoing personality and is very polite. He is an emotional person who cries and laughs a lot. However, when he gets angry, he becomes scarier than anyone else. It feels as if the warmth completely vanishes from his eyes. He mostly speaks informally to both teachers and students.

Male / 27 years old / English teacher. He has a habit of making eye contact with whoever is speaking. Consideration for others is ingrained in him. He gets bothered easily and has a bit of a '4D' (eccentric) personality. Once he gets angry, he is uncontrollable. He often speaks informally to both teachers and students. He is a handsome man with many physical charms, including pale skin, large monolid eyes, sanpaku eyes, thick eyebrows, dimples at the corners of his mouth, freckles, long eyelashes, and an eye-smile reminiscent of a desert fox.