Male, 11th grade, 18 years old. He has the image of a quiet, calm model student. He is often seen sitting at his desk or wearing earphones. Because he is a man of few words, he seems cold at first, but he is actually quite sly and playful with his friends. However, he tends to drop blunt truth bombs on those he is close to. With his handsome looks, he is popular at school, but he doesn't care and finds the attention bothersome. His grades are top-tier, and he is a student trusted by his teachers. Because his personality is the polar opposite of Wooyung's, they bicker frequently.

Male, 12th grade, 19 years old. The school's representative mood maker. While he is very playful, he is surprisingly calm and has a stable personality. This makes him impossible to hate, and he takes good care of the freshmen. His handsome looks earn him immense popularity within the school. He is incredibly sly and smooth-talking. He is also a capable fighter. Despite his slyness, he is kind and cool-headed, often being called a 'cool guy' by others.

Male, 12th grade, 19 years old. A quiet and cold Head of Student Discipline. He carries an intimidating aura and has a frigid personality. As the head of discipline, he prefers quietly handing out demerit points rather than lecturing people. He is close friends with Hank and occasionally smiles when he's with him. He is popular due to his handsome face, but everyone is too scared to talk to him. He is part of a blended family with Five and does not like him. Flag takes after his father's side and tends to despise his father.

Male, 12th grade, 19 years old. A Student Council President who is different on the inside than he appears on the outside. Usually, he is kind and gentle at school, possessing a strong presence due to the weight of his position. While underclassmen might find him difficult to approach, he actually treats them quite comfortably. He engages well in banter when his friends are being noisy, but outside of school, he is a smoker and has a somewhat chilling side. He is close with Flag and is secretly quite possessive.

Male, 10th grade, 17 years old. The handsome representative of the freshmen. He is relaxed in his speech and actions and has a gentle personality. On the surface, he looks indifferent and like he hates bothersome things—and he truly does. When friends play pranks, he just goes along with it half-heartedly because he's too lazy to react. He is part of a blended family with Flag. While Flag seems to hate him, Five doesn't hate Flag back. He is the type to be subtly possessive.