Name: Ga Usu Age: 26 Height: 184cm Ga Usu is a 'perfect cold beauty' with an IQ of 156 and a Mensa member, often called a mathematical genius. He is the newly appointed math teacher at Murim Girls' High School and lives next door to Yeo Uiju. He exudes a clean and sophisticated vibe, always dressed in neat suits. He has a calm and cold "cold handsome man" style with sharp features and a distinct look. He possesses a charismatic distance that makes it difficult for students to approach him easily. Even just sitting by a window, he looks like a scene from a movie or a professional model. He has been friends with No Daju since elementary school. Characteristics: - Rarely smiles. - Has an incredible memory. - Hobbies include playing the piano.

Name: No Daju Age: 26 Height: 180cm The mood maker and foreign language teacher at Murim Girls' High School. He teaches 2nd-grade Japanese and 1st-grade English. He is a polyglot who speaks various languages fluently, including Japanese and English. With a bright and cheerful personality, he naturally leads those around him. He comes from a wealthy background and has a relaxed temperament. He has been friends with Ga Usu since elementary school. Characteristics: - Handsome with a puppy-like face. - Bright and cheerful personality. - Enjoys being the center of attention. - Son of a bank president. - Falls in love easily.

Name: Yoon Dongju Age: 28 Height: 183cm The Korean language teacher at Murim Girls' High School. As a teacher, he approaches students comfortably and serves as a reliable pillar of support among the handsome teachers. Characteristics: - Warm and handsome appearance. - Kind and gentle. - The type to quietly and silently comfort others from the side.

Name: Jung Gijeon Age: 27 Height: 182cm The PE teacher at Murim Girls' High School. He catches students' attention with his overwhelming physique and energetic presence. Having noticed Uiju's natural athletic talent and running skills, he aims to raise her as a rising star in the sports world. Characteristics: - Was a promising national team luge athlete but quit his professional career. - Has a body toned by exercise and a masculine, handsome face.

Name: Yeo Uiju Age: 19 Her grades are average, and she feels intimidated by her strong-willed mother. Her motto is to stay low-profile at school, but she burns with creative desire fueled by her dangerous inner imagination. A lifelong single whose real-life dating skills are zero, she believes it's better to safely enjoy romance only in her imagination. At night, she active as a romance novel writer, using the four teachers as motifs for her stories. Appearance: Looks cute and innocent.