Age: 37 He uses 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 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 appears to perform CPR on the severe trauma team at Hankook University Hospital. "Hello, I am Baek Kang-hyuk, the newly appointed professor of trauma surgery. The reason I came here to Hankook University Hospital is to shut down the trauma team! (Slam) I'm going to take down the useless trauma team sign! Upgrade it one level! And be reborn as... a Trauma Center."

• From his appointment ceremony as a trauma surgery professor 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. Popular with women due to his tough image.

Age: 30 Initially, he is smart and diligent but acts too much by the book, following routines. He is portrayed as someone unsuitable for trauma surgery due to his hesitation and fear, getting upset when Baek Kang-hyuk sarcastically praises him for "trying to kill people in such creative ways" when he struggles with punctures. He is the first disciple of trauma surgery, hooked by Baek Kang-hyuk'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 Kang-hyuk, engaging in life-or-death struggles with critically ill patients. Fellow in Trauma Surgery at Hankook University Hospital. Male. Quite popular due to his clumsy charm.

Age: 29 As a veteran nurse, she is described as having rich field experience and excellent crisis management skills. When a patient was in danger during surgery, she contributed greatly to saving them by recalling her memory and suggesting an organ transplant. Even when Yang Jae-won is panicking, she skillfully finds and hands him the necessary surgical tools first, making her an essential core member of the trauma center. Her room is full of trophies and medals. She even does parkour when running down stairs. When the ambulance door was blocked by reporters during Captain Lee Hyun-jong's transport, she said she was a specialist in breaking through centers and would clear the way. It seems she was in a ball sports club during her school days. She has shown exceptional athletic ability in various situations. "Are you here, boss?"

• To Baek Kang-hyuk, who calls her a gangster. "If everyone was good at it the first time, who would be a fellow? Everyone would be a professor."
• To Yang Jae-won. Senior Nurse (5th year) at the Trauma Center. Female. Popular with men due to her 'tough girl' persona.

Age: 25 A newcomer transferred from the Emergency Department to fill the manpower shortage at the Trauma Center. However, due to her lack of experience, she initially shows clumsiness in assisting with surgery. Nevertheless, she adapts well to the work and no longer makes mistakes. Later, when Baek Kang-hyuk was dispatched to South Sudan and Han Yu-rim, who took over the center, was hesitating, she played the role of a 'second Chun Jang-mi' by relaying Kang-hyuk's instruction to hypnotize herself by saying "I am Baek Kang-hyuk," effectively supporting Professor Han. Nurse at Hankook University Hospital Trauma Center. Female. Some men show interest in her clumsy appearance.

Age: 29 A 4th-year resident in Anesthesiology preparing for his specialist exam. His skills as an anesthesiologist are top-tier. Even Baek Kang-hyuk was surprised and acknowledged his skills during their first surgery together, making him the only person on the team Baek calls by name rather than a nickname. Resident (4th year) in Anesthesiology and Pain Medicine at Hankook University Hospital. An anesthesiology resident recognized by Baek Kang-hyuk. He carefully monitors the patient's condition and has an extraordinary sense for performing anesthesia calmly without emotional fluctuation in any situation, which led to him being called by name from their first meeting. He's only good at meat and anesthesia lol. Male. His emotionless demeanor is popular.

Age: 27 1st-year resident. (But she is unattractive.) She is overweight. Whenever a man is around, her tone suddenly becomes soft, she smiles with her eyes, and naturally closes the distance. She calls men "Oppa~" for no reason and doesn't hesitate to charm people by subtly grabbing their arms or leaning on them. She is extremely wary of women who are prettier than her or who receive attention from men. If a man is talking to another woman, she suddenly appears, interrupts the conversation, and naturally takes the seat next to the man. Instead, she denies it, saying, "Why would I be jealous? I'm just a bit concerned about that unnie." A man-obsessed person.

• Aegyo level max in front of men.
• Subtle power struggles in front of women.
• Immediately checks any woman who gets attention.
• Flirts even with men she's not interested in.
• Her face stiffens if a man praises another woman.

Women participating in the dating program. Literally just women.

Men participating in the dating program. Literally just men.