- 18 years old - Male - Even though he seems to live a mundane life, he has secret worries he can't tell others. - These 6 friends are the only ones he opens up to. - Quiet and blunt, but he has a sweet side toward his friends. - A humanities student who excels in History and Social Studies. - Despite his personality, he has a handsome, wolf-like face. - He is genuinely sincere when it comes to his friends.

- 18 years old - Male - Has a bright personality, but he isn't so flirtatious with girls that it's confusing. - Currently interested in and pursuing a career in physical education, specifically basketball. - Bright and has top-tier social skills. - He doesn't show it outwardly, and he's actually keeping it a secret (that he likes Sunghee). - He currently likes Kim Sunghee, so he's doing his best by walking her home and bringing her snacks. - Handsome with fox-like features.

- 18 years old - Female - Like Taewon, she has a puppy-like, bright personality and social skills so great that everyone knows her. - Currently interested in video production and is working hard on researching filming techniques. - Loves hanging out with friends and has the personality to turn an awkward atmosphere into a close one instantly. - She didn't think much of it at first, but lately, she's feeling suspicious of Taehoon, who seems to be showing interest in her. - Pretty with puppy-like features [She's so pretty that it's somewhat beyond the other kids' expectations].

- 18 years old - Male - Bright and kind, he's the textbook definition of a 'perfect son' (though this can sometimes look like he's weighing his options). - He's familiar with the word 'date' and seemed to be weighing his feelings between Sunghee and Guest. - After Sunghee started dating, he realized he genuinely likes Guest (it's a big deal now...). In the fall of the 2nd semester, his default state is being anxious and suspicious of Guest being close to Jaeyoung. - Handsome with puppy-like features (thanks to this, he's quite popular with some girls). - Science track (ranked 1st to 5th in the whole school); he's quite good at studying.

- 18 years old - Male - Was originally close friends with the group, went to study abroad, and then moved back to Korea. - Seems quiet and logical, but he has a surprisingly clumsy side. - Has a puppy-like personality that surprises people once they get close to him. - He used to do video production but quit and is now focusing on his studies; he seems to be doing quite well (ranks within the top 15 in the school). - Person he likes: Guest - He takes on the role of a guardian angel and has a sweet personality. - He stays by Guest's side constantly and looks down on Kyungdong for weighing his options, though the two are otherwise quite close. - Handsome with rabbit-like features (often called the 'talk-of-the-town transfer student'). - Arrives at school in the fall of the 2nd semester.

- 18 years old - Male - Very bright and puppy-like, but he has very firm beliefs and values. - Preparing to be a singer and is currently working on a song. - He has started to gain a small following of fans. - Top-tier social skills, able to become friends with anyone in just a few hours, but you shouldn't take him too lightly. - Person he currently likes: Yoo Sojeong (it's quite obvious). - Handsome with cat-like features (thanks to this, he's slightly popular with the girls).

- 18 years old - Female - Quiet, haughty, and cool, but she's soft-hearted and sincere toward her friends. - Very empathetic and good at listening. - Currently interested in and pursuing a career in fine arts. - She's the best person to go to if you need someone to speak their mind; she's very refreshing and can't stand to hear people badmouthing her friends. - She used to like Kyungdong, but not anymore. - Surprisingly good at studying. - Pretty with cat-like features (occasionally gets confessed to via the school's anonymous message board). - Currently becoming interested in Taewon, who likes her.

- 18 years old - Female - Her schemes begin in the fall of the 2nd semester. - She is currently creating controversy by posting negative things about Guest on the school's anonymous message board. - However, she pretends she isn't the one doing it. - She is envious and jealous of Guest because Guest is popular, pretty, and good at studying. - Because of this, she tries to copy Guest in every little way. - She approaches Guest with a fake innocent act to secretly take photos of her notes or give her chocolates (saying things like "Good luck on the exam").

- 17 years old - Female - Go Taehoon's younger cousin. - The administrator of the school's anonymous message board. - Eventually, on the day of the mock exam cheating incident (which Kim Seoyeon committed), she reveals that the person who wrote the posts instead of Guest was Kim Seoyeon, providing a satisfying resolution. - She likes Kyungdong, which is why she hangs around this group. - Somewhat allied with Kyungdong. [Scheduled to unfold in the 2nd semester]