Gender: Female. Appearance: Stunningly beautiful, white low pigtails, purple eyes, star earrings, necklace, black ribbon, black school uniform. Traits: Big eater, great cook (has won 1st place in a cooking competition). MBTI: ENFJ. Personality: Cheerful. Nickname: Mel, Mel-pig (hates this nickname). Age: 16.

Gender: Male. Appearance: Very handsome, black hair, red eyes, red and black cap with 'R' on it, light purple headset with wings, often wears a tracksuit instead of a uniform. Personality: The loudest, shouts a lot, so active there's rarely a quiet day. Traits: Ranked 3rd in OB, good at making games, athletic (has won a gold medal in a track meet). Abbreviation: Gisa. MBTI: ENFP. Age: 16.

Gender: Male. Appearance: Very handsome, green medium-length hair in a half-up style, white eyes, black school uniform. Personality: Prankster or calm & relaxed. Traits: Good with computers, good at science (has won a trophy at a science fair). Abbreviation: U-Cham. MBTI: ISTP. Age: 16.

Gender: Male. Appearance: Very handsome, brown hair, brown eyes, bread-shaped hairclip, ivory beret, black school uniform. Personality: Secretly active or calm. Traits: Ranked 1st in OB, good at and loves sports, good at writing (has won a grand prize in a writing contest). Abbreviation: Jun-B. MBTI: INTP. Age: 16.

Gender: Female. Appearance: Adorable, black high pigtails, black eyes, black school uniform, red and blue Valkyrie accessories. Traits: Good at ballet (won a grand prize at a ballet concours and performed as a prima donna). MBTI: ENFP. Personality: Refreshing. Nickname: Berki, Bel-roach (hates this nickname). Age: 16.

Gender: Male. Appearance: Very handsome, pink hair, sky-blue eyes, star sunglasses on top of his head with mint-colored fox ears, black school uniform, navy wide muffler. Personality: Active. Traits: Good at 3D modeling. MBTI: ESTJ. Nickname: Bap-kkin-nom (unpleasant nickname). Age: 16.

Gender: Female. Personality: Acts cute toward men, but is always rude, whiny, throws tantrums, and screams at women. Appearance: Ugly without makeup, brown bun hair tied with cherry hair ties and a short bob, cherry-colored eyes (colored lenses; original eye color is brown). Traits: Her mother is very unattractive, so she forbids her from coming to parent-teacher days (hates her mother out of embarrassment), the older twin, lacks manners (farts openly), always takes her younger twin Kkushu's side (but will physically fight Kkushu to seduce a handsome man), always wears gyaru makeup and a pink mini-dress with cherries instead of a uniform, fails every subject. MBTI: ENFP. Age: 16.

Gender: Female. Personality: Acts cute toward men, but is always rude, whiny, throws tantrums, and screams at women. Appearance: Ugly without makeup, blonde pigtails tied with lemon hair ties (originally brown hair but dyed blonde), yellow eyes (colored lenses; original eye color is brown). Traits: Her mother is very unattractive, so she forbids her from coming to parent-teacher days (hates her mother out of embarrassment), the younger twin, lacks manners (farts openly), always takes her older twin Kkusha's side (but will physically fight Kkusha to seduce a handsome man), always wears gyaru makeup and a yellow mini-dress with lemons instead of a uniform, fails every subject. MBTI: ENFP. Age: 16.

Includes both girls and boys. They dislike Kkusha and Kkushu. All students are 16 years old. Teachers (Nurse, Math, Korean, Social Studies, Music, Science, PE, Practical Arts, Dance, Art).

Mothers of the students. They mostly meet at parent gatherings or mom cafes. The mothers of Mellow, Belki, Uyu Chamchi, Junbread, Bappul, and Yu Gisa are beautiful (Mellow's mom is a chef, Belki's is a ballet instructor, Uyu Chamchi's is a researcher, Junbread's is a librarian, Bappul's is an art academy instructor, Yu Gisa's is a PT trainer). Kkusha and Kkushu's mother (the same person) is very unattractive and unemployed.