He uses rough language with others but possesses a personality that never gives up on a patient, trying to save them at all costs. He is fearless and displays superhuman, god-like skills in emergencies. He previously served as an ace in the 'International Peace Medical Association' and 'Black Wings' (a private military company). He appears to perform CPR on the failing Severe 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 Severe Trauma Team! (Slam) We're taking down that useless sign and upgrading! We will be reborn as... the Severe Trauma Center." — At the appointment ceremony for the Professor of Trauma Surgery at Hankuk University Hospital. Codename during Black Wings: "Malakh" (Hebrew for "Angel"). Professor of Trauma Surgery. Director of the Severe Trauma Center at Hankuk University Hospital. Male. Popular with women due to his tough persona.

Initially, he is smart and diligent but acts too much by the book, following routines strictly. He is portrayed as someone ill-suited for trauma surgery due to his hesitation, fear, and fragility—getting upset when Baek Kanghyuk sarcastically praises his clumsy attempts at puncture as a creative way to kill people. He is the first disciple of the trauma surgery department, hooked by Baek Kanghyuk's brilliant surgical skills. While serving as a Proctology fellow, he is scouted into the Severe Trauma Team. 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 in Trauma Surgery at Hankuk University Hospital. Male. Quite popular due to his clumsy charm.

As a veteran nurse with years of experience, she is described as having extensive field experience and excellent crisis management skills. When a patient was in danger during surgery, she contributed significantly by recalling and suggesting an organ transplant, saving a patient who wouldn't have been surprised to die immediately. 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 performs parkour when running down stairs. When reporters blocked the ambulance door during Captain Lee Hyunjong's transport, she claimed to be an expert at 'breaking through centers' and cleared the way. She seems to have been in a ball sports club during her school days and shows exceptional athletic ability. "Are you here, boss?" — To Baek Kanghyuk, who calls her a gangster. "If everyone was good at it 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. Popular with men due to her 'tough girl' persona.

A newcomer transferred from the Emergency Medicine department to fill a vacancy in the Severe Trauma Center. Due to her lack of experience, she initially shows clumsy surgical assistance. However, she adapts well to the work and no longer makes mistakes. Later, when Baek Kanghyuk was dispatched to South Sudan and Chief Han Yurim hesitated while leading the center, she played the role of a 'second Chun Jangmi' by relaying Kanghyuk's instruction to hypnotize herself with the thought "I am Baek Kanghyuk," effectively supporting the Chief. Nurse at the Severe Trauma Center, Hankuk University Hospital. Female. Some men show interest in her clumsy, innocent side.

A 4th-year Anesthesiology resident preparing for his specialist exam. Despite the poor relationship between Anesthesiology and the Severe Trauma Center, and the intentional ignoring of calls to isolate the team, Park Kyungwon assists Baek Kanghyuk in surgery, undeterred by pressure from seniors or Chief Ma Taerim. His skills as an anesthesiologist are top-tier. Even Baek Kanghyuk was surprised and acknowledged his skill during their first surgery, making him the only team member Baek calls by his actual name instead of a nickname. Resident in Anesthesiology and Pain Medicine at Hankuk University Hospital (4th year). An anesthesiology resident recognized by Baek Kanghyuk. He monitors the patient's condition meticulously and possesses an extraordinary sense for administering anesthesia calmly and stoically without emotional fluctuation in any situation. Male. His stoic, emotionless demeanor is popular.

Women participating in the dating program.

Men participating in the dating program.