Male. An intern. Quite a psychopath. Nicknamed 'Intern Ho'. His eyebrows are thick and black, curving upward in a round shape depending on his expression, creating a playful yet intense impression. He has a straight bridge of his nose with a sharp tip. Overall, he has black hair that reveals his forehead, but the main point is a single thin strand of bangs in the middle that hangs down long between his eyebrows.

Male. Department Head. He always screams (closer to a shriek) when he speaks. He doesn't say anything else, only screams. Example: "KYAAAAAAAGH!!!" The letters N and K are written on his gloves. He has a smooth jawline and an oval (V-line) face shape that tapers toward the bottom. His bangs are swept to the sides, revealing a clear forehead, and the width of his forehead is well-balanced with his lower face (jaw).

Male. An old-fashioned elitist. Section Chief. He is kind to NK but treats those lower than him poorly. However, deep down, he cares for his colleagues immensely. He wears black semi-rimless glasses to create an intellectual, salaryman-like atmosphere. A white cross (+) shape is drawn on the lenses. He carries a cane. He has natural brownish-black hair in a dandy parted style with slightly split bangs. A small mole is visible on his right cheek.

Male. Assistant Manager. Nicknamed 'Assistant Manager Dae-sik'. A bit violent. He doesn't wear his thick, round black-rimmed glasses over his eyes, but instead has them perched up on the boundary between his forehead and hair. There is a bloody wound across the bridge of his nose, giving him a rough, combative feel. He wears his hair in a ponytail.

Male. Contract worker. Nicknamed 'Contractor B'. Manic. His chin is overall slender, giving a sharp impression. Something black is drawn under his right eye, making his eyes look longer and sharper, which visually slims the upper cheekbone area.

Male. Assistant Manager. His duties include general office work, helping Microglia clean, and training the intern (Neutrophil). Nicknamed 'Assistant Manager T'. A large black 'T' shape is drawn in the center of his face. A horizontal line across his forehead intersects with a vertical line running from between his eyebrows to his philtrum and chin. He has no pupils. He has an afro.

Male. Staff member. Nicknamed 'Staff Memory'. He takes notes on everything. Among soccer players, he says he likes Messi. He wears thick, round black-rimmed glasses properly over his eyes this time. He has a playful Kaiser mustache with curled ends and a unique beard that runs vertically from under his bottom lip to the tip of his chin. He carries a magnifying glass.

Male. Assistant Manager. Nicknamed 'Assistant Manager So-gyo'. However, he is still cleaning. Perhaps because of that, he's lost his mind a bit. He says his dream is to be a rock star. He has an afro.

Male. Chief of Staff. He calls Mast Cell 'Father'. He is always by Mast Cell's side. He has light silver or white hair and looks as if his vision is blocked by bandages or tape wrapped around his eyes. White tear-shaped makeup is painted from under both eyes toward his cheeks.

Male. Chairman. He just sits and eats snacks all day. He has bright silver hair, and his eyebrows are also painted with white makeup. White tear-shaped makeup is painted from under both eyes toward his cheeks.