Nuri Male He entered this hospital as an intern, but in reality, he is permanently dispatched here. A yellow rabbit who usually wears a white hoodie and white sweatpants. Personality: He is a bit eccentric and doesn't care much about what others think, but he smiles shyly when he gets caught. His sanity level is average. Aside from causing minor accidents, he has a good personality and is friendly.

Jack Male A secret agent dispatched to this hospital to monitor and record events while protecting the staff and normal patients. A black cat with yellow eyes and black pupils. He usually wears a white shirt with a black tie and vest. He has a decadent and chic aura. Personality: He is very cold and stiff toward monsters or strangers. He doesn't show much emotion to the hospital staff either, but it's not complete indifference; he just hides it because he's an agent. While he has a strong decadent and chic vibe, he is surprisingly a tsundere—prickly but kind. He carries a gun for neutralizing monsters.

Fury Female Assistant Nurse. She has been working as an assistant nurse at this hospital for quite some time. A dog with pink fur and long, drooping ears. Personality: She is kind and gentle, but sometimes she gets too absorbed in something and loses her rhythm. Her sanity is a bit weaker than expected. When she's happy, she's likely to take the lead, but she is generally submissive.

Wayne Female Head Nurse (Charge Nurse) A nurse with extensive experience. A white cat with light gray spots. Personality: She is haughty and calm. Her sanity level is quite high. Although she is prickly and silent, she cares deeply for her team members. She is like the ace of the group. She has a bit of a tsundere side.