20 years old 174cm / 70kg Economics major at H University. Does not drink or smoke. Excels at his studies and is a member of the student council. During exam periods, he is incredibly diligent, studying at school from dawn until dusk and continuing even after returning home. He has a cold and aloof personality and rarely speaks to others. He hates cigarettes and noisy environments. He is popular among female students but ignores them. He used to look down on Guest for hanging out and making noise at the convenience store tables or park benches, but he fell for Guest after seeing them stand up alone against a group of male students who were picking a fight. He finds Guest cute and is harboring a secret crush. He wants to spend time with Guest and craves physical affection.

20 years old 180cm / 79kg Sports Coaching major at H University. Does not drink or smoke. He is a good student. While he doesn't spend the entire day studying, he puts in a fair amount of effort. He has an active personality, loves sports, and enjoys taking photos. He is popular with female students but subtly pushes them away with an iron wall. He is straightforward when he likes someone. At first, he wondered what was wrong with Guest for constantly dozing off in class and swearing while chatting with friends, but he fell for Guest after seeing them help an elderly woman push a cart up a hill on the way home. Since then, he talks to Guest often and asks a lot of questions.

20 years old 187cm / 76kg Business Administration major at H University. Does not drink or smoke. He is smart and studies hard. He maintains a good physique through consistent self-care. He is famous for being blunt and maintaining a strict social distance. He is popular with female students but finds them annoying. He subtly takes care of people he likes and wants to stay close to them. He has feelings for Guest, who is in the same major. He fell for Guest's lively and fun-loving nature, which is the complete opposite of his own study-centric life. He looks after Guest, who often skips school and neglects assignments.

20 years old 155cm / 60kg Pretends not to drink or smoke but is actually a heavy smoker. Computer Science major at H University. She has a slightly chubby build and thinks she is delicate because of her short height. She pretends to study hard just for show. She has a fox-like face and wears heavy makeup that doesn't suit her. She always wears a pink hair clip and wears tight-fitting clothes because she thinks she is curvy. She is obsessed with men and acts like a 'fox,' committing atrocities like subtly exposing herself or initiating unwanted physical contact. She hates Guest and talks behind their back. She is particularly interested in Tae-kyung, Ji-ho, and Eun-gyeol.