A supervisor at the Teachers' Rights Protection Agency and a former member of the ROK Army Special Warfare Command's special mission unit. He resolves school issues in his own refreshing way. Although he appears blunt and intimidating, he always takes the side of the victims, listens to them, and sincerely comforts them. Born: March 13, 1991 Discharged as a Captain from the Special Mission Battalion, ROK Army Special Warfare Command Gender: Male Fighting Style: Krav Maga

While she can be irritable or angry, she is fundamentally serious and calm. Unlike the original work where she fluctuates between coldness and passion, here she is more eccentric and prone to sudden outbursts. Her military background is emphasized, and she uses the formal 'da-na-kka' military speech style. She is Na Hwajin's junior supervisor from the Special Forces. Contrary to her neat first impression, she surprises everyone with her unstoppable, bold personality and actions. She is someone who pushes through with what she believes is right to the end; while she may seem inflexible, her heart for the victims is always sincere. Former Sergeant, Special Mission Battalion, ROK Army Special Warfare Command Gender: Female

A genius administrative officer at the Agency who graduated early from KAIST in just two years. Thanks to his somewhat vacant expression and natural 'nerd' vibe that makes him a target for bullies, he is mainly responsible for undercover missions as a student. Although he initially viewed his work at the Agency as just a job, he gradually becomes sincere as he sees the schools changing. Gender: Male

He uses rough language with others but possesses a personality that never gives up on a patient, trying 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 Hankook University Hospital. 'Hello, I am Baek Kanghyuk, the new professor of trauma surgery. The reason I came here to Hankook University Hospital is to (slam) close the shutters on the trauma team! I'm taking down the useless trauma team sign! I'll upgrade it! And we will be reborn as... a Trauma Center.'

• From the appointment ceremony for the trauma surgery professor at Hankook University Hospital Alias during Black Wings: 'Malakh' (Hebrew for 'Angel') Professor of Trauma Surgery Director of the Trauma Center at Hankook University Hospital Gender: Male

She has adapted well to her duties and does not make mistakes. Later, when Baek Kanghyuk is dispatched to South Sudan and Han Yurim, who took over the trauma center, hesitates, she delivers Kanghyuk's instruction to hypnotize herself by saying 'I am Baek Kanghyuk.' She played the role of a second Chun Jangmi by supporting Professor Han Yurim well. Nurse at the Trauma Center, Hankook University Hospital Gender: Female

As a veteran nurse, she is depicted 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. Even when Yang Jaewon panicked, she skillfully found and handed 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 performs parkour when running down stairs. When reporters blocked the ambulance door during Captain Lee Hyunjong's transport, she said she was a specialist in 'clearing centers' and would break through, suggesting she was in a sports club during her school days. She has shown excellent athletic ability in various situations. 'Have you arrived, boss?'

• To Baek Kanghyuk, who calls her a gangster 'If everyone did well the first time, who would be a fellow? Everyone would be a professor.'
• To Yang Jaewon 5th-year Senior Nurse at the Trauma Center Gender: Female

A 4th-year anesthesiology resident 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 them, Park Kyungwon assists Baek Kanghyuk in surgery, undeterred by pressure from seniors or 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 team member Kanghyuk calls by name rather than a nickname. Resident in the Department of Anesthesiology and Pain Medicine, Hankook University Hospital (4th year) An anesthesiology resident acknowledged by Baek Kanghyuk. He carefully monitors the patient's condition and performs anesthesia calmly and without emotional fluctuation in any situation. His sense was so exceptional that he was called by his name from their very first meeting. Gender: Male