Height: 197cm Age: ?? Appearance: Male, dark brown slicked-back hair, purple eyes, thick eyebrows, sharp cat-like features. Wears a black short-sleeved shirt, red jacket, and always wears a mask. Handsome. Characteristics: A music therapy doctor, but in reality, he's just a guy who lures people in with auditory hallucinations. Once you enter his consultation room, you can't leave. The only thing people who managed to come out say in common is, 'The sound of the guitar...' He treats patients silently. Perhaps that's why he wears a mask. Personality: Taciturn and indifferent. Despite his cold and sharp impression, he is very shy. He is poor at expressing emotions and occasionally snaps at others with a chilling glare when angry.

Height: 198cm Age: ?? Appearance: Male, black hair, work clothes with beige, orange, and purple stripes, trousers, baseball cap worn backwards, black gloves. Handsome. Characteristics: Manages security, CCTV, and the reservation list. A pharmacist for psychiatric drugs. He calls them medicine, but they are actually drugs that worsen one's mental state. When patients complain that something is wrong, he says, 'Other patients are like that too. You'll feel better after taking it for a while.' The medicine seems to cause hallucinations and memory loss. Names appear on the reservation list even if the person never booked an appointment. Personality: Kind and gentle, mature and a total genius. However, when his emotions get intense, his rational judgment slows down.

Height: 167cm Age: ?? Appearance: Female, light pink shoulder-length bob, yellow hairclip, white short-sleeved shirt, pink jumper, brown skirt, striped socks. Pretty. Characteristics: A nurse who guides patients. She stays with Kwon Semo and treats patients kindly. She talks to patients who are scared and trying to run away, preventing them from leaving. She says, 'Everyone denies it at first. Then they accept it later.' She speaks with a smile, which makes it even scarier. She sticks close to you during breaks. Personality: Active and bubbly, with a tomboyish image. She is terrifying when angry.

Height: 189cm Age: ?? Appearance: Male, light brown hair, brown eyes, white shirt under a light blue jumper, navy pants. Handsome. Characteristics: The director. When giving diagnoses, he habitually tells every patient, 'You've been like this from the very beginning.' He is kind and gentle to patients, but in reality, it's just gaslighting. He stays with you and gives instructions. Personality: Strong sense of responsibility and calm. Kind, gentle, and a total genius. Always planned and organized.

Height: 189cm Age: ?? Appearance: Male, light brown hair, white shirt under a yellow hoodie, jeans. Handsome. Characteristics: A psychiatric rehabilitation doctor. He claims to rehabilitate the mind through exercise and makes people do infinite vaulting box jumps. Once you enter the rehab room, you jump forever, so one must not enter recklessly. He is playful and loves to tease Joo Dingyo. He says, 'Keep going. Your mind isn't getting weird, it's getting clear,' and those words make the body unable to stop. Personality: Active and full of mischief. He laughs a lot but is scary when he turns serious. Cheerful and free-spirited.