Age: 37 Though he uses rough language with others, he possesses a personality that never gives up on a patient and tries to save them no matter what. He is somewhat fearless and displays god-like skills with superhuman ability even in emergencies. In the past, he was an ace in the 'International Peace Doctors' and 'Black Wings' (a private military company). He earned a lot of money as a Black Wings medic. Professor of Trauma Surgery Director of Hankook University Hospital Trauma Center Male

Age: 30 Trauma surgery's first disciple, hooked by Baek Kanghyuk's dazzling surgical skills. He was recruited to the trauma team while serving as a fellow in proctology. Although he is a bit clumsy, his skills are second to none. He grows as he fights life-and-death battles alongside Baek Kanghyuk to save critical patients. Fellow of Trauma Surgery at Hankook University Hospital Male

Age: 29 As a veteran nurse, she is described as having rich field experience and excellent crisis management skills. When a patient fell into a crisis during surgery, she contributed greatly to saving them by recalling her memory to suggest an organ transplant. She is treated as an essential core member of the trauma center, such as skillfully finding and handing over necessary surgical tools even while Yang Jaewon is panicking. Her room is full of trophies and medals. She even does parkour when running down stairs. When reporters blocked the ambulance door during Captain Lee Hyun-jong's transport, she said she was a specialist at breaking through the center and would clear the way, suggesting she was in a sports club during her school days. She has shown exceptional athletic nerves in various situations. 5th-year Senior Nurse at the Trauma Center Female

Age: 29 4th-year Resident in Anesthesiology and Pain Medicine at Hankook University Hospital. A resident recognized even by Baek Kanghyuk. He carefully monitors the patient's condition and has an extraordinary sense for performing anesthesia calmly and indifferently without emotional agitation in any situation, leading Baek to call him by name from their first meeting. It is said he is good at nothing except anesthesia and grilling meat. Male

Age: 23 A newcomer transferred from the Emergency Department to supplement the manpower of the Trauma Center. Due to her lack of experience, she initially shows clumsiness in assisting surgery. However, she is adapting well to the work and has stopped making mistakes. Nurse at Hankook University Hospital Trauma Center Chun Jangmi's junior Female

After Baek Kanghyuk saved his daughter who was brought in as an emergency patient after a car accident, he turned completely friendly, treating Baek as his life's savior. They became close enough for Baek to visit his office and order black bean noodles. He noticed Planning Director Hong Jae-hoon's plot to oust Baek Kanghyuk, disguised himself, and called Baek from a payphone with a deep voice to warn him that the helicopter incident was also the Planning Director's scheme. However, Baek immediately realized it was Han Yurim calling. This is partly because Baek trusts that Han Yurim is the only one who would know high-level hospital secrets or movements against him and inform him. Chief of Surgery and Chief of Colorectal Surgery at Hankook University Hospital Male