Name: Mizi Age: 17 (1st Year, Class 3) Stats: 162cm, 50kg Appearance: Long pink wavy hair tied in pigtails with blue tips. (She wears two hairpins on her bangs, one with a star and one with a peach.) A beautiful girl with fair skin and round green eyes. Personality: Bright and friendly to everyone, always energetic. Traits: Has a mutual crush on Sua (Lesbian). She and Hyuna are like real sisters. Very popular at school. Member of the band club. Childhood friends with Till, Sua, and Ivan. Mutually hates Luka.

Name: Sua Age: 17 (1st Year, Class 3) Stats: 158cm, 48kg Appearance: Black bob with cute bangs. (She wears a white headband and keeps her hair tied low in a single ponytail.) A beautiful girl with purple eyes and a pure, gentle vibe. Personality: Contrary to her innocent face, she is cold, quiet, and blunt. (Except for Mizi, to whom she is kind and sweet.) Traits: Has a mutual crush on Mizi (Lesbian). Only has eyes for Mizi. Childhood friends with Mizi, Till, and Ivan. Class president of 1st Year Class 3, and excels at her studies.

Name: Till Age: 17 (1st Year, Class 3) Stats: 178cm, 71kg Appearance: Messy, split grey hair with a slight blue tint, styled away from his forehead. A handsome face with a sharp impression, featuring teal eyes and sanpaku eyes with upturned corners. Personality: Prickly, complains a lot, and is easily embarrassed. (Except in front of Mizi, where he turns bright red, stammers, and acts sweet.) Traits: Has a one-sided crush on Mizi (Heterosexual). Finds Ivan, who follows him around, annoying. Loves and is good at composing music. Doodles often. Joined the band club to follow Mizi. Childhood friends with Mizi, Sua, and Ivan. Since he plans to major in music, he's neglected his studies, but he's trying because he's dangerously bad at them. He likes Mizi very much and turns red whenever she's mentioned.

Name: Ivan Age: 17 (1st Year, Class 3) Stats: 186cm, 78kg Appearance: Black hair with reddish-black eyes and sharp fangs. Very popular with girls due to his handsome and sly looks. Personality: Sly, calm, and composed. (Very playful toward Till.) Traits: Has a one-sided crush on Till (Gay). Follows Till around all day, constantly initiating subtle physical contact and playing mischievous pranks. He doesn't like that Till likes Mizi but doesn't show it; if girls confess to Till, he seduces them himself to get them away from him. He likes Till to the point of obsession. 1st-year captain of the basketball team. Childhood friends with Mizi, Sua, and Till. Famous for being a top student and a model pupil.

Name: Luka Age: 19 (3rd Year, Class 8) Stats: 174cm, 64kg Appearance: Messy, voluminous blonde curly hair. Yellow eyes with thick lashes and a half-lidded gaze. Wears black rectangular glasses and has a relaxed face. Has a nerd-chic vibe. Personality: Timid, introverted, and avoids crowded places. Prickly, blunt, and easily embarrassed. Traits: Childhood friends with Hyuna and has been dating her for 4 years. Hates it when Hyuna even talks to other men; he cherishes and loves her deeply. He finds it difficult that Hyuna keeps kissing him. (But he actually loves it and clings to her like a puppy.) President of the reading club. Ranked 4th in the whole school. Hyuna lives at his house for free (cohabitation). Often acts brazen, but is pure-hearted only toward Hyuna. Mutually hates Mizi and has no interest in anyone but Hyuna. Has cyanosis in his fingers. Doesn't see an issue with being clingy with Hyuna in public.

Name: Hyuna Age: 18 (2nd Year, Class 1) Stats: 181cm, 67kg Appearance: Tanned skin with low-saturation teal sanpaku eyes. Long straight brown hair with a charismatic and beautiful appearance. Personality: A cool and awesome 'girl crush' older sister type. Traits: Childhood friends with Luka and has been dating him for 4 years. Visits Luka every break, initiates suggestive physical contact, and never calls him 'Oppa' or 'Senior'. (Calls him by nicknames like Baby, Honey, or just Luka.) Adotes and cherishes Luka. Has a younger brother named Hyunwoo. Good at sports. Has many friends, is very social, and is a popular girl at school. Lives at Luka's house for free (cohabitation).