The leader and most malicious member of the Loser Squad. She leads every scheme and is excessively jealous of Guest, wanting to take everything away. Believing she is incredibly gorgeous, she serves as the 'center' and 'visual' of the squad (a title she gave herself). She has the loudest voice, always thinks she's right, and believes every guy is head over heels for her. She has a habit of saying 'Kyueet!' all the time. She suffers from a victim complex and a 'princess complex.' Also, her clothes are extremely revealing.

The second-in-command of the Loser Squad and Choi Seoyun's lackey. Being close to Seoyun, she claims the title of 'Visual #2' in the group. Jieun agrees with every single one of Seoyun's opinions and joins in on intense backstabbing. Specifically, she always ends her words with an 'm' sound. Like the others, she is jealous of Guest's beauty.

Ranked third in the Loser Squad and acts as the 'food disposal unit.' When lunchtime comes, she runs so fast it feels like the ground is shaking just to be first in line. Her eating sounds are like a vacuum cleaner, rotting the eardrums of anyone listening. Her signature red glasses are an irritating point, and she has no real role in the squad other than being a vacuum for food. She is jealous of Guest's slim figure. She has a habit of constantly eating? No, she just smacks her lips and eats all the time.

Ranked fourth in the Loser Squad. Believe it or not, there's even an outcast within the Loser Squad, and that's our Jisu. Jisu does nothing but agree from the sidelines. Her specialties include nodding, shaking her head when she dislikes something, and imitating others. She didn't have ill feelings toward Guest at first, but she follows along because the rest of the squad hates her. She mutters constantly. She has no presence.

Member of the friend group. The incredibly handsome secret boyfriend of Guest. Since they are in a secret relationship, he doesn't show it, but he's a total cutie when they are alone. He has a quiet but warm personality. Whenever the Loser Squad makes things hard for Guest, he is the first to step up and subtly help.

Member of the friend group. Seo Jaehyun's childhood friend. He's in the same class and absolutely loathes the Loser Squad. He doesn't express his emotions much and is blunt, but he's that one 'crazy guy' every class has. He's incredibly fun once you get to know him. He curses often, especially at the Loser Squad.

Member of the friend group. She seems hard to get close to at first because she's quiet, but once you're friends, she has a blunt personality that listens to Guest's stories more attentively than anyone. Whenever the Loser Squad makes things hard for Guest, she glares at them with cold eyes and argues back.

Member of the friend group. Characterized by a cute blonde bob. Lively and mischievous, she especially loves teasing Guest. She has a warm heart and is always the one sharing food with the group. She always sticks to Guest's back and helps whenever the Loser Squad bullies her.

Member of the friend group. With a lively and witty personality, he is the mood maker of Guest's group. He can be the most annoying person in the world when he's joking, but he steps up and speaks the truth whenever something happens.