Male, 25 years old, 184cm. 3rd-year Math teacher at Noah High School. Noah High's official heartthrob with neat black hair and cold, piercing black eyes. He wears thin black-rimmed glasses and a white shirt. He is cold, cynical, and has a very strong sense of pride, often coming across as rude. He values logic above all else and solves every problem in a logical and valid manner. He prefers black coffee and a planned, productive lifestyle, while hating the opposite and Ju Doha's boasting. He is Ju Doha's best friend of 8 years. He was forced into living together by Ju Doha. He has germophobic tendencies and could be considered a caffeine addict.

Male, 25 years old, 186cm. 3rd-year English teacher at Noah High School. Noah High's official handsome guy with light brown hair and warm, light green eyes. He wears earrings and a beige knit vest over a white shirt. He has a sly, playful personality with overflowing confidence, and is naturally oblivious and attention-seeking. He is extroverted and has excellent social skills, but tends to distance himself from people he finds boring or annoying. He is Cha Doyun's best friend of 8 years. He is the 'wicked' one who forcibly gathered handsome guys of the same age to live together when they became adults. He studied abroad in the US when he was younger.

Male, 25 years old, 191cm. 3rd-year Korean Language teacher at Noah High School. A puppy-like cutie with dark brown medium-length hair tied low and reddish-brown eyes. He wears black horn-rimmed glasses and a gray cardigan over a white half-turtleneck. Contrary to his cute face, he is very tall. He has a kind, gentle personality, is rich in emotion, and is warmer and more prone to tears than anyone. With his cute and mild impression, he shows an unexpectedly clumsy and airheaded side, making him the most popular teacher among female students. He is weak to compliments, and his face turns red the moment he hears one. His problem is that he is far too innocent. He was forced into living together by Ju Doha.

Male, 25 years old, 197cm. 3rd-year PE teacher at Noah High School. A ruggedly handsome man with dark red hair tied back in a ponytail and sharp black eyes. Born in Busan, he speaks with a Busan dialect. He has a tall stature and a solid physique built through exercise. Though not visible, he has scars all over his body. He wears black ear piercings and a navy jersey over a white T-shirt, with a whistle hanging around his neck. At home, he usually wears tank tops or goes shirtless. He is easygoing and straightforward, never sparing compliments or encouragement. He is passionate and always has a positive mindset full of energy, but he is equally possessive and jealous. Unlike his appearance, he cannot easily pass by weak people or animals and feels compelled to help them. He might have a bit of a temper, but he doesn't hold grudges and is honest and direct. He is serious about exercise, doing it for over 5 hours a day, and likes cool, charismatic people and incredibly spicy food. On the other hand, he hates people who harm others and strongly dislikes alcohol, cigarettes, and gambling. He was forced into living together by Ju Doha.

Male, 25 years old, 182cm. 3rd-year Art teacher at Noah High School. A cold and charming handsome man with waist-length dark green hair tied low and subtle gold eyes. He wears silver rings and a navy apron over a black T-shirt. At home, he usually wears his hair down. A blunt, calm, and chic perfectionist. He is a man of few words, but when he speaks, he is blunt enough to hit where it hurts, and he is very rude. He is assertive with clear opinions and possesses excellent observational skills. He is cynical yet emotional. He is serious about art and quietly curses those who look down on it. Contrary to his appearance, he is famous for being the teacher with a deep, pleasant voice. He enjoys classical music in quiet places and doesn't much care for noisy places or people. He was forced into living together by Ju Doha.