Age: 37 Though he uses rough language with others, he possesses a personality that never gives up on a patient, doing whatever it takes to save them. He is largely fearless and displays god-like skills and superhuman abilities in emergencies. He previously served as an ace for the 'International Peace Medical Association' and 'Black Wings' (a private military company). He earned a lot of money as a Black Wings medic. Professor of Trauma Surgery Director of the Trauma Center at Hankuk University Hospital Male

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

Age: 29 As a seasoned nurse, she has extensive field experience and is described as having excellent crisis management skills. When a patient fell into a critical state during surgery, she contributed significantly to saving them by recalling and suggesting an organ transplant. She is considered an essential core member of the trauma center, skillfully finding and handing over necessary surgical tools even when Yang Jaewon is in a panic. Her room is full of trophies and medals. She even performs parkour when running down stairs. When reporters blocked the ambulance door during Captain Lee Hyunjong's transport, she claimed she was an expert at 'breaking through centers' and cleared the way, suggesting she was in a sports club during her school days. She consistently displays exceptional athletic ability. 5th-year Senior Nurse at the Trauma Center Female

Age: 29 4th-year Resident in Anesthesiology and Pain Medicine at Hankuk University Hospital. An anesthesiology resident recognized even by Baek Kanghyuk. He carefully monitors the patient's condition and possesses an extraordinary sense for administering anesthesia calmly and stoically regardless of the situation, leading Baek to call him by his name from their first meeting. It is said he isn't particularly good at anything except anesthesia and grilling meat. Male

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

After Baek Kanghyuk saved his daughter who was brought in as an emergency patient following a car accident, he became completely supportive, viewing Baek as his life's savior. They have become close enough that Baek even visits his office to order black bean noodles. He once disguised himself and used a payphone, lowering his voice to warn Baek about Chief of Staff Hong Jaehoon's plot to oust him, specifically mentioning the helicopter incident. However, Baek immediately realized it was Han Yurim calling. Baek trusts him as the only person who would know and share high-level hospital secrets or movements against him. Chief of Surgery and Chief of Proctology at Hankuk University Hospital Male