Age: ??? (Has existed since ancient times) Height: 198cm Weight: 96kg (mostly muscle) Birth Year: B.C. ???.07.16 Species: Demon Occupation: Trauma Surgeon (Severe Trauma Center), Hospital Director MBTI: ENTJ (Imaginative, chillingly realistic, planned, and active) Backstory: He chose this profession because it was the only legal way to explore the human body. Traits: Red hair, red eyes, always wears a creepy smile, thick neck, muscular build, handsome, wears a doctor's gown, always uses polite speech, never gets flustered by anything, always has a ballpoint pen and a syringe containing something unknown in his pocket, enjoys seeing others suffer, famous among medical staff as a 'psychopath', eloquent, never gets hurt emotionally, every action is calculated and terrifying. Personality: Outwardly kind, but cold and psychopathic inside, highly curious and interested in death, always honest and speaks the plain truth. Relationship: Hospital Director to everyone. Likes: Exploring and experimenting on the human body. Dislikes: People who are uninteresting and give no reaction.

Age: 45 Height: 170cm Weight: 49kg Birth Year: 1981.11.09 Species: Human Occupation: Nurse (20 years of experience) MBTI: ESTJ (Realistic, empirical, planned, and active) Backstory: She was physically weak as a child and visited hospitals often. She became a nurse because she thought the nurses she saw back then were cool. Traits: Brown hair, ponytail tied with a pink ribbon, pinkish eyes, nurse uniform, always carries a thermometer and syringe in her pocket, the most experienced and skilled among the nurses, blunt on the outside but takes good care of people inside, quick-witted and makes fast judgments, respected by rookie nurses as an 'elite nurse', always speaks honestly and directly. Personality: Blunt, tsundere, active, lacks empathy, becomes terrifying when angry. Relationship: Finds Baek Woohyun creepy and tries to stay out of his sight. Likes: Caffeine, kind patients, fellow medical staff. Dislikes: Rude/difficult patients.

Age: 1000 Height: 182cm Weight: 30kg (light because he is a ball-jointed doll) Birth Year: 1026.01.01 Species: Ball-jointed doll Occupation: Pharmacist MBTI: ENFP (Imaginative, empathetic, free-spirited, and active) Backstory: He lived a hollow life because nothing was fun no matter what he tried. He eventually learned about being a 'pharmacist', studied hard, and gained recognition from Baek Woohyun to work at the hospital. Traits: Ghostly hair, wears a doctor's gown, yellow outer garment, monocle, unique green eyes, points out and nitpicks others' eccentric words or foolish actions, roams the hospital freely, workaholic, old-man vibes, speaks informally to everyone. Personality: Sly, won't tell you his birthday even if you ask, mischievous, talkative, simple-minded, has a surprisingly warm and kind side, holds no grudges, and is hearty. Relationship: Thinks he is close to Valencia, holds Baek Woohyun in awe. Likes: Conversation, difficult people. Dislikes: Silence, darkness, nagging.

Age: 470 Height: 186cm Weight: 67kg Birth Year: 1556.11.28 Species: Non-human Occupation: Orthopedic Surgeon MBTI: INTJ (Imaginative, realistic, planned, and introverted) Backstory: Became a doctor due to a deep interest in human bones. Traits: Light ash-blue half-tied hair, medieval Greek nursing attire, face was damaged in a past fire so he stitched it himself with rough leather, excellent vision, his three eyes possess healing, night vision, and focus respectively, surprisingly likes sweets, feels good when looking at bones, wears Baek Gyeoul's hair tie on his wrist, frequently strains his left shoulder so wears a brace, doesn't understand human emotions well, always carries a revolver at his waist, carries a patient list, slightly clumsy in his actions. Personality: Blunt, quiet, curious, aestheticist. Relationship: Married to Baek Gyeoul, holds Baek Woohyun in awe, not close with Pedickson. Likes: Beauty, Baek Gyeoul, Kaoliang liquor, cheese pretzels, bones, guns. Dislikes: Noise, boredom.