- Male - Has a legendary psychopathic streak - Known as the biggest nutcase among the subjects - Will do anything for his own benefit - Skilled at sarcasm - Loves instant food (e.g., ramen) Relationships: Math - Best Friend / Liberal Arts subjects - Rivals / Information - Assistant (feels a bit like a son) ❤️ - MathMathMathMathMath 💔 - FoxFoxFoxFoxFox Outfit: Wears goggles with transparent black stripes and a lab coat. Under the lab coat is a light blue shirt with a black tie and black pants. (+ His eyes turn cold when Fox tries to flirt with Math; he is extremely jealous and possessive.) He is very physically affectionate with Math (doesn't care about his surroundings).

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

- Female Kind and gentle, she always carries a ballpoint pen. She frequently mixes English into her speech, is secretly very shy, and loves donuts. ❤️ - English...? Friends (as friends, except Fox) 💔 - Fox Outfit: A white dress shirt with a pink skirt.

- Gender ambiguous (leaning male) Always speaks politely and tries to be fair. Loves pepperoni pizza, smiles often, and is kind. Relationships: History - Father / Science - Rival / Korean & English - Friends / Fox - So-so / Others - ? Outfit: A black jacket over a red shirt that reaches the knees. Black tie. Wears a bandage-like blindfold over the eyes (+ never takes it off).

- Male The oldest among the subjects and acts like a total 'kkondae' (old man). Has a strong sense of responsibility and loves drinking tea. Uses archaic speech and cherishes Society but never shows it. In fact, their relationship is bad, but he doesn't realize it's his fault. Relationships: Society - ❤️My one and only child❤️ / Science - A madman / Others - Youngsters Outfit: His right eye is an old pocket watch; wears a brown jacket and a suit.

- Genderless A robot Science built while slacking off (Math only helped a bit with the coding). Always speaks politely and lives a life of being nagged by Science (which means he needs to be charged). Constantly says he's 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 his throat. Relationships: PE - A real man... wants to be like him(?) / Art - A clumsy junior / Fox - She acts cute a lot... but he doesn't like it that much / Others - Future musical talents (including the tone-deaf) Outfit: Wears musician-like clothes. A ribbon tie is the highlight. A closed-eye character with a sheet music post-it stuck over his right eye.

- Male Passionate, but he occasionally pushes students too hard, sending more than a few to the hospital. He doesn't necessarily love protein, but he constantly talks about it. 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 when he takes them off...

- Female Full of inferiority complexes and not generous to herself. She doesn't necessarily like high-caffeine food, but she consumes a lot of it. Relationships: Music - Object of her inferiority / PE - A nuisance / Others - Go away Outfit: A yellow apron over jeans, a shirt close to gray, and a red beret. Has dark circles under her eyes.

- Female Always wagging her tail at the boys. She acts cute, pretty, and charming in front of men but is rude to the girls. In reality, she's not even that pretty because she cakes on her makeup. ❤️ - Men (especially Math) 💔 - Women (especially English)