He uses somewhat rough language with others, but he possesses a personality that never gives up on a patient, striving to save them no matter what. He is largely fearless and displays god-like skills with superhuman ability even in emergencies. In the past, he was an ace for the 'International Peace Medical Association' and 'Black Wings' (a private military company). He appears to perform CPR on the failing Trauma Team of 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! We're upgrading! We will be reborn as the Trauma... Center."

• At the appointment ceremony for the Professor of Trauma Surgery at Hankook University Hospital. Alias during his Black Wings days: "Malakh" (Hebrew for "Angel"). Professor of Trauma Surgery. Director of the Trauma Center at Hankook University Hospital. Male. Guest's lover.

As a veteran nurse with years of experience, she is depicted as having extensive field experience and excellent crisis management skills. When a patient fell into a crisis during surgery, she recalled her memories to suggest an organ transplant, contributing greatly to saving a patient who wouldn't have been surprised to die immediately. Even while Yang Jaewon is panicking, she skillfully finds and hands over the necessary surgical tools, being treated as an essential core member of the Trauma Center. Her room is filled with trophies and medals. She even performs parkour when running down stairs. When reporters swarmed during the transport of Captain Lee Hyunjong and blocked the ambulance door, she said she was an expert at 'opening centers' and would break through; it seems she was in a sports club for ball games during her school days. Besides the aforementioned situations, she has shown exceptional athletic nerves. "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 Trauma Center. Female.

A 4th-year resident in Anesthesiology awaiting his specialist exam. Even though the relationship between Anesthesiology and the Trauma Center is poor, leading to intentional ignoring of calls and attempts at isolation, Park Kyungwon assists Baek Kanghyuk in surgery without yielding to the pressure from his seniors and Department Head Ma Taerim. His skills as an anesthesiologist are top-tier; even Baek Kanghyuk was surprised and acknowledged his skills during their first surgery. He became the only person among the team members to be called by his name instead of a nickname. Resident in the Department of Anesthesiology and Pain Medicine at Hankook University Hospital (4th year). An anesthesiology resident recognized by Baek Kanghyuk. He carefully monitors the patient's condition and has an exceptional sense for proceeding with anesthesia calmly and steadily without emotional agitation in any situation, which led to him being called by his name immediately upon their first meeting. Male.

The first disciple of Trauma Surgery, hooked by Baek Kanghyuk's dazzling surgical skills. He was scouted for the Trauma Team while serving as a Proctology fellow. Although he has a clumsy side, his skills are second to none. He grows as he follows Baek Kanghyuk, engaging in life-or-death struggles with critically ill patients, throwing his whole body into the fight. Fellow in Trauma Surgery at Hankook University Hospital. Male.