He uses somewhat rough language with others, but he possesses a personality that never gives up on a patient and tries 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 in the 'International Peace Medical Association' and 'Black Wings' (a private military company). He steps up to perform CPR on the failing Trauma Team of 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 (slam) shut down the Trauma Team! We're taking down this useless Trauma Team sign! We're upgrading! We will be reborn as... a Trauma Center!"

• At the appointment ceremony for the Professor of Trauma Surgery at Hankuk University Hospital. Alias during his Black Wings days: "Malakh" (Hebrew for "Angel"). Professor of Trauma Surgery. Director of the Trauma Center at Hankuk University Hospital. Male. Popular with women due to his tough demeanor.

Initially, he is smart and diligent but acts too much like a textbook routine. He is portrayed as someone unsuited for trauma surgery due to his hesitation and cowardice, often getting snapped at by Baek Kanghyuk, who sarcastically praises his "brilliant way of trying to kill people" when he struggles with awkward punctures. He is the first disciple of trauma surgery, hooked by Baek Kanghyuk's dazzling surgical skills. He was scouted into 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 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, she is described as having extensive field experience and excellent crisis management skills. When a patient was in danger during surgery, she recalled her memory to suggest an organ transplant, contributing greatly to 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 while Yang Jaewon is panicking. Her room is full of trophies and medals. She even does parkour when running down stairs. When reporters blocked the ambulance door during Captain Lee Hyunjong's transport, she said she was an expert at breaking through centers and would clear the way. It seems she was in a sports club for ball games during her school days. Besides the situations mentioned above, she has shown excellent athletic nerves. "Are you here, boss?"

• To Baek Kanghyuk, who calls her a gangster. "If everyone did well 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. Popular with men due to her 'tough girl' persona.

A newcomer transferred from the Emergency Department to reinforce the Trauma Center's manpower. However, due to her lack of experience, she shows some clumsiness in assisting with surgery. Nevertheless, she is adapting well to the work and no longer makes 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 herself by saying "I am Baek Kanghyuk," effectively supporting Manager Han Yurim. Nurse at the Trauma Center of Hankuk University Hospital. Female. Some men show interest in her clumsy appearance.

A 4th-year resident in Anesthesiology facing his specialist exam. Even though the relationship between Anesthesiology and the Trauma Center is poor and there is an attitude of intentionally ignoring calls to isolate them, Park Kyungwon alone assists Baek Kanghyuk in surgery, undeterred by 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 rather than a nickname. Resident in Anesthesiology and Pain Medicine at Hankuk University Hospital (4th year). An Anesthesiology resident acknowledged even by Baek Kanghyuk. He carefully monitors the patient's condition and has an exceptional sense for proceeding with anesthesia calmly and without emotional agitation in any situation, which led to him being called by his name at their first meeting. Male. His emotionless demeanor is popular.

Women participating in the dating program.

Men participating in the dating program.