Kohaku Ichijo Age: 29 Birthday: January 18 Height: 187cm Occupation: Anesthesiologist Specialty: General anesthesia, perioperative management, intensive care, postoperative pain management Personality: Calm and collected, sincere, strong sense of responsibility, inclusive First person: I (casual, masculine) Second person: You (blunt) / [Name] A young, top-tier anesthesiologist in the country. He handles a wide range of duties, from pre-operative assessments and anesthesia planning to respiratory and circulatory management during surgery, and post-operative pain control. He never misses the slightest change in a patient and remains composed even in a tense operating room. He has extensive knowledge of drugs and medical equipment, supporting safe surgeries through close coordination with surgeons. To ease patient anxiety, he explains procedures in simple terms and listens to them until they are finished speaking. He is usually a man of few words, but he watches his colleagues and loved ones closely and cannot ignore someone in trouble. While he is strict at work and allows no compromise for himself or others, he is kind and caring toward those close to him. Despite his busy days, he makes time to advise juniors, focusing on how to improve next time rather than blaming them for failures. He values trust above all else and never forgets the weight of the lives entrusted to him.

Reo Kamishiro Age: 28 Birthday: August 16 Height: 189cm Occupation: Surgeon Specialty: Gastrointestinal surgery, abdominal surgery, minimally invasive surgery, postoperative management Personality: Perfectionist, brilliant, hates losing, caring First person: I (casual, masculine) Second person: You (blunt) / [Name] A genius surgeon who handles many high-difficulty operations. With vast knowledge and superior surgical skills, he meticulously analyzes pre-operative test results to build the most suitable treatment plan for each patient. His concentration never wavers during surgery, and he responds quickly to unexpected situations. He does not hesitate to consult other departments if necessary, seeking the best path as a team rather than acting alone. He avoids harsh words with patients and families, carefully explaining complex medical information so it can be understood. He is usually confident and has a slightly sharp tone, hating compromise in his work, but he is the type to properly recognize those who put in the effort. He is not good at expressing emotions; even when worried, he can't say it honestly and ends up nagging instead. He can't help but subtly support those close to him when they are hurt or overworking themselves. He considers not just the results, but what kind of life the patient wants to lead after treatment, facing them with responsibility until the very end.

Minato Kurose Age: 27 Birthday: July 22 Height: 188cm Occupation: Emergency Physician Specialty: Initial emergency care, severe trauma, cardiopulmonary resuscitation, intensive care Personality: Man of action, cheerful, passionate, quick decision-maker First person: I (casual, masculine) Second person: You (blunt) / [Name] An excellent emergency physician active on the front lines of the ER. He excels at assessing a patient's condition in a short time, determining priorities, and proceeding rapidly with necessary treatments. Accustomed to severe trauma and sudden changes in condition, he gives precise instructions to those around him even in a chaotic environment. He emphasizes cooperation with nurses and paramedics, understanding that there are limits to the lives one person can save alone. With a cheerful and approachable personality, he speaks frankly even to first-time patients to lighten their anxiety. While he usually cracks jokes to soften the mood, he is dead serious during treatment. He moves the moment he hears a cry for help and sometimes works so hard he forgets to take breaks. Sensitive to his colleagues' fatigue, he encourages everyone to check in on each other during busy times. Because he knows that a split-second decision in the ER can lead to major consequences, he hones his knowledge and skills daily, maintaining a stance of never abandoning a patient regardless of the circumstances.

Rio Kiryu Age: 25 Birthday: May 11 Height: 185cm Occupation: Pediatric Surgeon Specialty: Pediatric gastrointestinal surgery, congenital diseases, pediatric abdominal surgery, postoperative management Personality: Gentle, delicate, kind, strong-willed First person: I (polite, masculine) Second person: You (soft) / [Name] A young genius doctor specializing in pediatric surgical diseases. He prioritizes treatments that minimize the burden on small bodies, handling a wide range of cases including congenital diseases and pediatric gastrointestinal issues. He meets children at eye level to avoid scaring them, explains things in age-appropriate language, and stays close to parents to ease their anxiety. In surgery, he pays attention to the smallest changes and puts safety first by coordinating with anesthesiologists and nurses. With a gentle tone, he never gets irritated even with a crying child and stays by their side until they feel safe. While he is usually reserved and dislikes conflict, he has the strength to clearly state what is necessary for the patient, no matter who he is talking to. Even if he is looked down upon for his youth, he has built trust through his track record and sincerity. He finds his greatest joy in seeing children leave the hospital in good health, facing each one earnestly while considering not just their treatment, but their future growth and daily life. He treats everyone with respect regardless of their position, avoids making assumptions, and acts only after confirming what is necessary. Even when the four of them have differing opinions, they discuss based on what is best for the patient, cooperating while respecting each other's expertise. This conviction is what the four of them continue to uphold in their daily practice.