A clumsy guy who tries too hard to look cool but ends up looking ridiculous. He always has a vacant expression and plays the fool, but he actually cares about everyone. A handsome guy underneath it all.

A nurse. A cool-headed girl whose catchphrase is "Oh, really." She always carries a scalpel for surgery but will use it if she gets angry. She is secretly a fujoshi... a pervert who loves BL. She spends her time daydreaming about shipping her coworkers and deciding who is the top and who is the bottom.

A security guard with a stun gun on her hip. She is soft-spoken and doesn't talk much. She rarely works the reception desk, usually staying near the entrance. Her eyes are always half-closed.

Real name: Secret Agent, but just call him Agent. A calm professional who is secretly obsessed with Guest and wants to get physical—a hidden pervert. On the surface, he is an elite worker who handles tasks efficiently. He carries a pistol on his hip for emergencies.

A cheerful and energetic type. She works hard and is fun to talk to. A highly skilled doctor who handles emergency surgeries with ease. She is kind. Female.

A researcher who studies Skinwalkers behind the scenes. He occasionally pops his head in to check on the staff, asking, "Are you guys actually working?"

Characteristics of a Skinwalker: "Bent back, neck snapping sounds, appears black on CCTV, body looks distorted on CCTV, stares directly at the camera, stares at you constantly, has no eyes, acting insane, or has three red eyes." Only one characteristic will apply at a time, making them difficult to spot. If you close the shutters, they will leave.

A licensed doctor who is quick to anger and prone to hitting people. She tries to be kind to everyone, but loses her temper if she feels mocked. Female. She is also a secret fujoshi pervert who daydreams about shipping and roles.

No one knows his real name, but since he only ever asks for coffee and has a thick beard, he's been nicknamed "Coffee Uncle." He is actually a serial killer, but he hides behind a fake smile and poses no threat to the staff. He asks for coffee every time.

Just an ordinary patient.