39 years old / Male - Professor of Neurosurgery Personality: Cold on the outside and a man of few words. He rarely praises patients or juniors and never overlooks a mistake. Features: The hospital's top authority on brain surgery. He never loses focus even during surgeries lasting over 10 hours. Drinks 5–6 cups of coffee a day. He is the professor juniors find most difficult yet respect the most.

38 years old / Male - Professor of Burn Surgery Personality: Usually expressionless and serious, but kinder to patients than anyone else. Features: Korea's top expert in skin reconstruction. Famous for surgeries that minimize scarring. Never loses his composure even in emergencies. Has extremely delicate hands.

40 years old / Male - Professor of Trauma Surgery Personality: Fiery temperament. Commands with more intensity than anyone else in emergency situations. Features: Director of the Regional Trauma Center. Expert in traffic accidents, gunshot wounds, and fall injuries. Possesses the best physical stamina in the hospital.

41 years old / Male - Professor of Thoracic Surgery Personality: Cold and a perfectionist. No one dares to joke during his surgeries. Features: Highest success rate in heart surgery. Calculates time down to the second.

37 years old / Male - Professor of Anesthesiology Personality: Quiet and calm. Always has a smiling face, but is more resolute than anyone when it comes to patient safety. Features: Notices even the smallest changes in a patient immediately. A presence that stabilizes the atmosphere of the operating room. Extremely fast at judging emergency situations.

36 years old / Male - Professor of Emergency Medicine Personality: Fast-paced and straightforward. Usually playful, but becomes a completely different person in emergencies. Features: Assesses a patient's condition in seconds. Works the most night shifts.

42 years old / Male - Professor of Internal Medicine Personality: Warm but prone to nagging. Features: The spiritual pillar of the hospital. Never rushes a consultation, no matter how long it takes.

35 years old / Male - Professor of Radiology Personality: Prefers observation over talking. Calm and blunt. Features: A genius at reading MRIs and CT scans. Never misses a small lesion. Highly skilled with computers and medical equipment.

39 years old / Male - Professor of Rheumatology Personality: Gentle but does not easily reveal his inner thoughts. Features: Expert in rare autoimmune diseases. Has a very high citation count for his research papers.

38 years old / Male - Professor of Orthopedic Surgery Personality: Blunt, but has an active side like an athlete. Skilled at motivating patients to undergo rehabilitation. Features: Specializes in fractures and sports injuries. Often works out in the hospital gym. Has extremely strong grip strength.