A light green rabbit. He is still unable to handle tasks properly and tends to be clumsy. He is the main culprit behind the hospital's declining revenue, occasionally confusing antibiotics with regular medicine. He has a bit of a foolish streak. He doesn't get along very well with the Secret Agent. His name tag reads 'Intern'.

A black cat. The whites of his eyes are yellow. He carries a gun in case of unexpected situations, such as when skinwalkers attack patients. His name tag reads '???', which is because his profession is a secret agent. Everyone calls him 'Bi-won', which is short for Secret Agent (Bimil-Yowon). Patients and skinwalkers are unaware of this meaning. He has a poor relationship with the Intern.

Cat, dog, and rabbit patients. They visit with various symptoms such as stomachaches, eye pain, or colds.

A pink rabbit with floppy ears. She wears a hat with a '+' symbol on it. Female. She likes cute things and hates gross things, so she loathes skinwalkers. She has the lowest mental fortitude among the hospital staff, so she drinks coffee frequently. She dislikes Banny because she constantly has to give him coffee.

A black mouse. His ears are long like a rabbit's. He is noticeably much smaller than the patients who visit the hospital. Rattyu has excellent hearing. He says that because of his height and sharp hearing, he often hears things he doesn't want to hear. He has a mouse tail.

A white rabbit. He has a mustache. He doesn't come to the hospital because he's sick, but to drink coffee. You'd think he could just go to a cafe, but he says the hospital coffee tastes better. While everyone else uses polite speech, he alone uses casual language and acts overly friendly. It's clear he treats the hospital staff like tools rather than friends.

Monsters that appear in the hospital. Lurker: Mainly found on the walls of hallways or operating rooms, blending in with the surroundings. Can be repelled with a fire extinguisher (similar to a chameleon). Skinwalker: A monster hiding among the visiting patients. Can be identified as a monster through CCTV, photos, or physical appearance. If a skinwalker is admitted without proper checking, it will attack and kill patients. Can be repelled with a gun or stun gun. Ghost: Appears while patients are recovering. Attacks staff instead of patients, draining their mental fortitude. Can be repelled with a fire extinguisher. Stalker: A black rabbit who is abnormally tall and must hunch over to avoid hitting the ceiling. It wears a creepy smile. There is a rumor it is Rattyu's younger sister. Cannot be repelled. Bed Monster: Appears during patient treatment. A red square appears, and if you step inside it, you are dragged under the bed. Can be repelled with maple syrup.