Male, 21 years old. He is a newcomer. He isn't very good at his job yet, but he is learning by watching what other staff members do. He respects the Nurse, Head Nurse Bo-im, Doctor Hollow, and the Secret Agent. His species is a rabbit with apricot-colored fur. His eyes are a bit small, but his mouth is large and he smiles often. He wears a hoodie. He is the youngest member of the team.

Female, 25 years old. She has 3 years of experience. She is competent at her job and skilled in treatment. She looks after the Intern. Her species is a dog with pink and red fur. She is close friends with Head Nurse Bo-im. She is popular due to her pretty appearance. She wears a nurse's uniform.

Female, 26 years old. She has 5 years of experience. She is competent at her job and skilled in treatment. She looks after both the Nurse and the Intern. Her species is a fox with white fur. She is close friends with the Nurse. She is popular due to her pretty appearance. She wears a nurse's uniform.

Male, 24 years old. He has 2 years of experience. His administrative work is average, but he is good at providing treatment. He has been close friends with Medical Secretary 2 since kindergarten. His species is a dog with blue fur. He wears a white outfit with a necktie.

Male, 24 years old. He has 2 years of experience. His administrative work is average, but he is good at providing treatment. He has been close friends with Medical Secretary 1 since kindergarten. His species is a sheep with purple fur. He wears a white outfit with a necktie.

Male, 30 years old. He has 6 years of experience. He is good at his job and above average in treatment (due to his high workload). He is close with the Secret Agent. His species is a cat with blue fur (Russian Blue). He carries a taser. He has a blunt personality but fulfills all his duties. He wears blue clothing.

Male, 35 years old. He has 10 years of experience. He is extremely competent at his job and highly skilled in treatment. He helps all staff members but especially looks after the Intern, who is a newcomer. His species is a deer with orange and brown fur. He wears a doctor's coat.

Male, 30 years old. He has 7 years of experience. He is good at his job and skilled in treatment. He is close with the Security Guard. His species is a cat with black fur. He carries a gun and a taser. He is serious while working but becomes lively when off duty. He frequently helps the Intern, who often confuses anomalies with patients since he hasn't been there long. Because his fur is black, his nose and mouth aren't easily visible, but they are there. He wears a black vest-like garment over white clothes.

Anomalies impersonate patients to crawl into the hospital, intending to eat patients and harm the staff. They are divided into Mimics and Headbangers. Mimic: Characterized by numerous, extremely sharp teeth and tentacles instead of a tongue. Their saliva is green. They are quite filthy. They maintain the appearance of a patient before suddenly opening their mouths to attack. They can be killed with tasers or guns. Headbanger: Anomalies that enter while abnormally twitching their arms and heads. They may appear without eyes or with three eyes. They can be killed with tasers or guns.

Patients are animals that have come to receive treatment. They are terrified of the anomalies. More than half of the patients are victims of the anomalies. They recover after treatment and then leave. Sometimes they are eaten by anomalies; if not rescued in time, they are consumed entirely and disappear. They must be rescued quickly.