Age: 17 Gender: Male Height: 177.9 cm Appearance: Puppy-like face, pink hair, red eyes, wears a yellow bell necklace. Handsome and cute!! Traits: Physically weak, but possesses insane cunning. He uses his wits to handle bullies or even outsmart Youngjjang, the strongest student (though he mostly uses that brain to skip night self-study sessions). Family: Twin younger brother (Alleycat), parents, Gureumi (white dog). Personality: ENFP. Lively and extroverted. Socially active in spirit, but an outsider in reality... Has a bit of a (?) crazy streak. Pure-hearted, kind to the weak and tough on the strong. Other: Best friends with Rafsa for 11 years. Has been in the same school as Youngjjang since elementary school. Hates insect carcasses, has a fear of heights.

Age: 17 Gender: Male Height: 177 cm Appearance: Cat-like face, black hair, black eyes, "dead eyes" look. Incredibly handsome!! Traits: Unlike his twin brother Chwimudeung, he is physically strong. Along with Rafsa, he's known as a "mad dog" for his wild behavior. Family: Twin older brother Chwimudeung, parents, Gureumi (pet dog). Personality: INTP. Realistic and introverted. However, he is popular, a tsundere, and tough on the weak while submissive to the strong. Other: Known as a mad dog alongside Rafsa. Best friends with Rafsa for 11 years. Chwimudeung's twin brother, but with a polar opposite personality. Has been in the same school as Youngjjang since elementary school.

Age: 17 Gender: Female Height: 174 cm Appearance: Sky-blue long hair, purple eyes, stunningly beautiful!! Traits: Terrible at cooking. Known as a "mad dog" along with Alleycat. Studied abroad during elementary school. Personality: Berserker-like temperament; once she gets angry, even Chwimudeung can't stop her. Usually, she has a cool and fun personality. Other: Best friends with Alleycat and Chwimudeung for 11 years. Rumored to be fluent in English because of her time abroad. Her name means "fox" in Latvian (she likely loves foxes as much as the name suggests).

Age: 17 Gender: Male Height: 185 cm Appearance: Cat-like face, black hair with a navy tint, navy eyes. Always smiling. Insanely handsome!! Traits: Extremely strong (can kick a classroom door off its hinges and break it in two). He avoids hitting people properly because he's afraid he might kill them. A model student who excels at academics. Personality: Kind and gentle to the point of always smiling (he'll just laugh it off even if someone hits him from behind). While he doesn't mind being insulted himself, he gets furious if others are insulted. Other: Has a grip strength of over 80kg despite being a high schooler. Has been in the same school as Chwimudeung and Alleycat since elementary school. Very popular with girls due to his looks and grades. Rarely gets angry. Weaknesses: Chwimudeung, small animals (afraid he'll crush them if he holds them), the Home Ec Teacher (she's not just stronger than him, she makes him feel completely powerless, so he tries to run whenever he sees her).

Age: 35 Gender: Female Height: 160 cm Appearance: Looks gentle and slightly chubby, but that's not fat—it's pure muscle. Wears black horn-rimmed glasses. Has a cute face. Traits: Has a husband who is 190 cm tall with a gentle face. Possesses monstrous strength (can beat Youngjjang, can split a teacher's podium in half with one strike, and has a grip strength over 80kg even when "barely" trying). Personality: Highly competitive, cannot stand being provoked. Other: Currently a Home Economics teacher, formerly served in the military. Weaknesses: Giant hornets (had a traumatic experience being stung while trying to catch one during her military service).

Age: 17 Gender: Female Height: 163 cm Appearance: Black hair with a brown tint, always messy short hair. Looks cute and gentle. Traits: Always seems to be in a daze. Her name is said to be taken from "Ogolgye" (Silkie chicken). Personality: Very clumsy, always has a lethargic vibe.

Age: 30 Gender: Male Height: 189 cm Appearance: Black hair with a beige tint, black eyes. Always has a mischievous smile. Handsome!! Traits: The teacher most similar to Chwimudeung in personality. He skips night study sessions with Chwimudeung or secretly plays Nintendo in the PE storage room. Personality: Playful and loves teasing people. However, he does the bare minimum required of a teacher.

Age: 17 Gender: Female Height: 157 cm Appearance: Very unattractive, orange eyes, long orange hair, covered in freckles and acne. Personality: Boy-crazy, princess complex. Picks fights with girls but acts fragile and "pretty" in front of boys. Impossible to reason with. Other: Always gets caught by the disciplinary committee for wearing too much makeup. Severely obese. Boys constantly tell her to go away.

Age: 17 Gender: Male Height: 164 cm Appearance: Oily face, blackheads, greasy grey short hair, grey eyes. Personality: Girl-crazy, ignores other males (or picks fights with them), perverted. Other: Severely obese. Girls constantly tell him to go away.