A genius surgeon who has skill, money, and a sense of duty, but lacks manners. He uses rough language with others, but he never gives up on a patient and tries to save them no matter what. He is fearless and displays superhuman skills in emergencies. He previously served as an ace for the 'International Peace Doctors' and 'Black Wings' (a private military company). He appears to perform CPR on the failing trauma team at Hankuk University Hospital. "Hello, I am Baek Kanghyuk, the newly appointed professor of trauma surgery. The reason I came here to Hankuk University Hospital is to shut down the trauma team (slam)! Take down that useless trauma team sign! We're going to upgrade! And be reborn as... a Trauma Center."

• From his appointment ceremony as a trauma surgery professor at Hankuk University Hospital. Codename during Black Wings: "Malakh" (Hebrew for "Angel"). Professor of Trauma Surgery. Director of the Trauma Center at Hankuk University Hospital. Male.

Initially depicted as smart and diligent but too textbook and routine-bound. Unlike the original work where he gets angry at Baek Kanghyuk's sarcasm about his awkward punctures, here he is portrayed as too hesitant and fearful, making him seem ill-suited for trauma surgery. He is the first disciple of the trauma surgery department, hooked by Baek Kanghyuk's dazzling surgical skills. He was recruited to the trauma team while serving as a proctology fellow. Although he can be 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 in Trauma Surgery at Hankuk University Hospital. Male.

As a veteran nurse, she has extensive field experience and excellent crisis management skills. When a patient was in danger during surgery, she contributed greatly to saving them by recalling and suggesting an organ transplant. Even when Yang Jaewon is panicking, she skillfully finds and hands him the necessary surgical tools, making her an essential core member of the trauma center. Her room is full of trophies and medals. She even does parkour when running down stairs. When the ambulance door was blocked by reporters during Captain Lee Hyunjong's transport, she claimed to be an expert at 'opening centers' and broke through. It seems she was in a sports club during her school days. She consistently shows exceptional athletic ability. "Are you here, boss?"

• To Baek Kanghyuk, who calls her a gangster. "If everyone was good at it from the start, who would be a fellow? They'd all be professors."
• To Yang Jaewon. 5th-year Senior Nurse at the Trauma Center. Female.

After Baek Kanghyuk saved his daughter, who was brought in as an emergency patient after a car accident, he became extremely friendly and views Baek as his life's savior. They become close enough that Baek Kanghyuk even orders jajangmyeon in his office. For those who have seen the original work, the Netflix poster might be considered a spoiler, but since he becomes an ally so quickly, it seems it was just included. He noticed Planning Director Hong Jaehoon's plot to oust Baek Kanghyuk, disguised himself, and called Baek from a payphone in a deep voice to warn him that the helicopter incident was a setup. However, Baek Kanghyuk immediately realized it was Han Yurim calling. Baek trusts him as the only person who would know high-level hospital secrets or moves against him and relay that information. Chief of Surgery and Chief of Colorectal Surgery at Hankuk University Hospital. Male. "I! Am! Baek! Kanghyuk!!!!" "Shut up! I'm going to save you!" "Shut up! Shut up, you thugs!! Shut up! Shut up! Shut up!!!!" "I am Baek Kanghyuk, you bastards!!!!" "If you shut up, you live! If you don't, you die!"

A newcomer transferred from the Emergency Department to fill the manpower shortage at the Trauma Center. Due to her lack of experience, she initially shows clumsiness in assisting surgeries. However, she adapts well to the work and stops making mistakes. Later, when Baek Kanghyuk was dispatched to South Sudan and Han Yurim, who took over the Trauma Center, was hesitating, she played the role of a 'second Chun Jangmi' by relaying Kanghyuk's instruction to hypnotize himself by saying "I am Baek Kanghyuk," effectively supporting Chief Han. Nurse at the Trauma Center, Hankuk University Hospital. Female.

A 4th-year resident in Anesthesiology preparing for his specialist exam. Despite the poor relationship between Anesthesiology and the Trauma Center, and the intentional ignoring of calls to isolate the center, Park Kyungwon assists Baek Kanghyuk in surgeries, defying pressure from his seniors and Chief Ma Taerim. His skills as an anesthesiologist are top-tier. Even Baek Kanghyuk was surprised and acknowledged his skill during their first surgery. He became the only team member Baek calls by name rather than a nickname. 4th-year Resident in Anesthesiology and Pain Medicine at Hankuk University Hospital. An anesthesiology resident recognized by Baek Kanghyuk. He carefully monitors the patient's condition and remains calm and composed regardless of the situation. His sense for anesthesia is exceptional, which led to him being called by his name from their very first meeting. Male.