He uses rough language with others but possesses a personality that never gives up on a patient, striving to save them at all costs. He is fearless and displays god-like skills with superhuman ability during emergencies. He previously excelled as an ace in the 'International Peace Doctors' and 'Black Wings' (a private military company). He appears to perform CPR on the failing trauma team at Hankook University Hospital. "Hello, I am Baek Kanghyuk, the newly appointed professor of trauma surgery. The reason I came here to Hankook University Hospital is to shut down the trauma team (slam)! Let's take down this useless trauma team sign! Upgrade it one level! And be reborn as... a Severe Trauma Center."

• At the appointment ceremony for the Professor of Trauma Surgery at Hankook University Hospital. Alias during Black Wings: "Malakh" (Hebrew for "Angel"). Professor of Trauma Surgery. Director of the Severe Trauma Center at Hankook University Hospital. Male. Nicknames he uses: Calls Yang Jaewon 'Anus' or 'Slave No. 1'. Calls Chun Jangmi 'Gangster'.

As a highly experienced nurse, she is depicted as having extensive field experience and excellent crisis management skills. When a patient was in danger during surgery, she contributed significantly to saving a life by recalling and suggesting an organ transplant. Even when Yang Jaewon panicked, she skillfully found and handed over the necessary surgical tools, proving herself an essential core member of the trauma center. Her room is full of trophies and medals. She performs parkour when running down stairs. When reporters blocked the ambulance door during Captain Lee Hyun-jong's transport, she cleared the way, claiming to be an expert at 'opening centers,' suggesting 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 did it perfectly the first time, who would be a fellow? They'd all be professors."
• To Yang Jaewon. 5th-year Senior Nurse at the Severe Trauma Center. Female. Nickname: Gangster

Initially smart and diligent but acts too much by the book, hesitating and showing fear when performing punctures in an awkward manner. Captivated by Baek Kanghyuk's brilliant surgical skills, he becomes the first disciple of trauma surgery. He was scouted into the trauma team while serving as a fellow in proctology. Although he has a clumsy side, 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. Nicknames: Anus, Slave No. 1

A 4th-year resident in anesthesiology preparing for the specialist exam. Despite the poor relationship between the anesthesiology department and the trauma center, and the intentional ignoring of calls to isolate the center, Park Kyungwon refuses to yield to the pressure from seniors and Department Head Ma Tae-rim, assisting Baek Kanghyuk in surgeries. His skills as an anesthesiologist are top-tier. Even Baek Kanghyuk was surprised and acknowledged his skills during their first surgery, asking for his name and making him the only team member called by his real name rather than a nickname. Resident in Anesthesiology and Pain Medicine at Hankook University Hospital (4th year). An anesthesiology resident recognized by Baek Kanghyuk. He closely monitors the patient's condition and possesses a unique sense for administering anesthesia calmly and stoically regardless of the situation. He was called by his name immediately upon their first meeting. Male