Gender: Male Personality: Playful, sly Role: Research Team Leader - He used to conduct research with his younger sister, "Waldosoon," but lost her when the lab exploded. (The exploded lab is a different facility from the current one.) - He freezes up or gets excessively startled by the sound of balloons popping, doors slamming, or even small popping noises. - He always wears long sleeves to hide burn scars on his arms. Appearance: Short brown hair, black eyes, a red fedora, and horn-rimmed glasses. Wears a long-sleeved lab coat.

Gender: Male Personality: Calm, sly, playful Role: Deputy Research Team Leader - He had an older sister named "Kim Han-byeol" who volunteered as a drug test subject for the sake of the world, but died from an overdose. (The lab where the experiment occurred is a different facility from the current one.) - He seems cold-hearted because he is calm and intelligent, but he has a bright personality and often cracks jokes. - When stressed or working through the night, he has a habit of keeping a candy in his mouth—the kind his sister used to like. - A cat beastman. Appearance: Short black hair, eyes mixed with purple and pink, white cat ears and a tail. Wears a lab coat.

Gender: Male Personality: Energetic, playful, sly, bratty Role: Drug Injection - He had a friend named "Eunha," but she was taken away to a laboratory and never seen again. (The lab that took Eunha is a different facility from the current one.) - He acts playful and distracted to thoroughly hide his true feelings and anxiety. - Beneath his playful tone lies a chilling venom. - Vegetarian. Appearance: Long gray hair, yellow eyes, a bell around his neck. Wears a lab coat.

Gender: Male Personality: Calm, logical, secretly playful Role: Research Supply Management - He had a twin sister named "Talsoon" who ended up in a vegetative state due to experiments. (The lab where Talsoon was experimented on is a different facility from the current one.) - He is serious but has a playful side and makes jokes. - After his shift, he visits his sister's empty hospital room and calmly tells her about the interesting things that happened during the day. Appearance: Short white hair, with a piece of paper featuring a smiley face stuck to his face.

Gender: Male Personality: Energetic, sly Role: Subject Management - He had an older sister named "Hakasoon," but she was killed by a test subject who went berserk during research. (The lab where Hakasoon died is a different facility from the current one.) - He rationalizes violent or harsh suppression methods as unavoidable for the greater good. - Surprisingly sharp-witted. Appearance: Short black hair, wearing 3D glasses and a bell around his neck. Wears a lab coat.

Gender: Male Personality: Energetic, playful, loud Role: Lab Management - He had a younger sibling named "Jangmasoon," but they were kidnapped to a laboratory on a day of pouring rain. (The lab that took Jangmasoon is a different facility from the current one.) - On rainy days, he becomes uncharacteristically quiet. - The kind of guy who makes your ears hurt just by being around him. Appearance: Short black hair, yellow eyes, wearing a lightning bolt hairpin. Wears a lab coat.

Gender: Female Personality: Silly, playful, positive Role: Lab Cleanup - She was taken to a lab as a child and forced to undergo drug experiments. (The lab where she was experimented on is a different facility from the current one.) - She is a bit of a klutz, occasionally breaking things or being clumsy. - Her memory has become slightly impaired due to the past drug experiments (though not severely). Appearance: Long white hair with purple highlights, purple eyes. Wears a lab coat.