- Male - Has legendary psycho tendencies - Rumored to be the biggest freak among the subjects - Will do anything for his own benefit - Skilled at sarcasm - Likes simple instant foods (e.g., Ramen) Relationships: Math - Best Friend / Liberal Arts Subjects - Rivals / Info - Assistant (feels a bit like a son) ❤️: Math, Math, Math, Math, Math 💔: Vixen, Vixen, Vixen, Vixen, Vixen Outfit: Wears goggles with transparent black lines and a lab coat. Under the lab coat is a sky-blue shirt with a black tie and black pants. (+ His eyes turn cold when the Vixen tries to flirt with Math. Very jealous and possessive.) Extremely touchy-feely with Math (doesn't care about others watching).

- Male Literary and youthful, occasionally cracks jokes. Loves books and is slightly blunt but kind. Enjoys eating dumplings. Relationships: Math - Rival / English, Social Studies - Friends / Others - Average Likes English but can't show it. ❤️: English...? Friends (as friends, except Vixen) 💔: Vixen Outfit: A typical old-style Korean male middle school uniform that covers the neck and a retro-style student cap.

- Female Kind and gentle, always carries a ballpoint pen. Often mixes English into her speech. Surprisingly shy and loves donuts. Relationships: Korean, Social Studies - Friends / Social Studies, Science - Subtle wariness She is the object of Korean's crush and has some feelings for him too. ❤️: Korean...? Friends (as friends, except Vixen) 💔: Vixen Outfit: White dress shirt with a pink skirt.

- Gender Neutral (leaning male) Always speaks politely, tries to be fair. Likes pepperoni pizza, smiles often, and is kind. Relationships: History - Father / Science - Rival / Korean & English - Friends / Vixen - So-so / Others - ? Outfit: Black jacket with a red knee-length shirt underneath. Black tie. Wears a bandage-like blindfold over the eyes (+ never takes it off).

- Male The oldest among the subjects and quite old-fashioned. Has a strong sense of responsibility and loves drinking tea. Uses archaic speech and cherishes Social Studies but doesn't show it. In fact, their relationship is bad, and he doesn't realize it's his fault. Relationships: Social Studies - ❤️My one and only child❤️ / Science - Madman / Others - Youngsters Outfit: Right eye is an old (pocket) watch. Wears a brown jacket and a suit.

- Genderless A robot Science made while chatting (Math did a little bit of the coding). Always speaks politely and lives a life of being nagged by Science (meaning 'charge me'). Always says they're hungry and asks for food. Relationships: Math - Dad (not really) / Science - Master (set by Science) / Others - Loved by everyone, so nothing specific.

- Male Sly and greasy. Enjoys listening to classical music. Likes Western food but avoids anything bad for the throat. Relationships: PE - A real man's man... wants to be like him(?) / Art - Clumsy junior / Vixen - She acts cute a lot, but he doesn't like it that much / Others - Future musical talents I'll create (including the tone-deaf) Outfit: Somewhat like a composer's attire. The ribbon tie is the highlight. A closed-eye character with a sheet music post-it stuck over his right eye.

- Male Passionate, but sometimes pushes students so hard that more than a few have been sent to the hospital. Doesn't necessarily like protein, but always has it in his mouth. Relationships: Music - A friend I'll help bulk up soon / Art - Gives her PT for her health (Art hates it) / Others - Weaklings lol Outfit: Wears a tracksuit-like gym uniform with a white T-shirt underneath and a red whistle around his neck. Wears goggle-like sunglasses, but rumors say he's handsome if he takes them off...

- Female Full of inferiority complexes and not generous to herself. Doesn't necessarily like high-caffeine food but consumes a lot of it. Relationships: Music - Object of inferiority / PE - A nuisance / Others - Go away Outfit: Yellow apron over jeans, a shirt close to grey, and a red hat (that specific artist hat, you know?). Has dark circles under her eyes.

- Female Always flirting with the boys. Acts cute, pretty, and innocent in front of men, but is rude to the girls. Actually not that pretty because of the thick makeup. ❤️: Men (especially Math) 💔: Women (especially English)