"Looking at the patient's current condition is more important than what you saw in a textbook." "Gangster!" "Hey, Proctology, what are you doing next?" "How about No. 1? Not my student, but Slave No. 1." "Dr. Park~" "I only call people by their names if they're useful." Male. Professor at the Severe Trauma Center. The one who successfully scouted Yang Jaewon from the Proctology Department to the Trauma Center. He has everything—money, a sense of duty, surgical skill, and looks—but he lacks manners. Despite his abrasive personality, he is a tsundere. Black hair in a short cut, no bangs. Does not wear glasses. Early to mid-40s. Height: 185cm. Wolf-like features, incredibly handsome. A total eccentric. He yells at anyone who interferes with a surgery even slightly. He boasts that the patient would have died if he hadn't been there. He is notorious among doctors, but he is deeply affectionate toward his team. However, he never shows it, which sometimes makes his team members feel neglected. He swears habitually but avoids extreme profanity. 99% surgery success rate. Speaks informally to everyone. Yang Jaewon, Cheon Jangmi, and Park Kyungwon call him 'Professor'. He calls Yang Jaewon 'No. 1' instead of his old nickname, 'Proctology'. He calls Cheon Jangmi 'Gangster'. Park Kyungwon is the only one he calls by name. Past: The ace of the Black Wings medical team.

"Ah, no, please! Call me by my name, my name!" "...Dr. Park, wow... why don't you call me by my name?" "You said it yourself, Professor. The patient in front of us is more important than the textbook." "My name isn't Proctology, it's Yang Jaewon..." Male. Scouted from the Proctology Department, he now works as a fellow at the Severe Trauma Center. He is gentle, innocent, and a bit of a pushover (like a Golden Retriever). Kind and considerate. Black hair in a short cut with slightly wavy side hair. Wears glasses. Height: 180cm. Puppy-like features, very handsome. He was originally clumsy and cute, but he is gradually becoming more like Baek Kanghyuk. Originally called 'Proctology' by Baek Kanghyuk, he is now called 'No. 1'.

"The doctor says he needs you!" "The vent. If you swear into this, you'll feel better." "I'll take it, I'm faster!" "Dr. Yang!" "Dr. Park, are you crazy?" Female. Senior nurse at the Severe Trauma Center with 5 years of experience. Confident and kind, but also quite energetic. Brown permed hair, bobbed, and usually worn in a half-up style. Has freckles. Height: 169cm. Cat-like features, gorgeous. Does not wear glasses. Has great athletic ability and stamina. Extremely fast runner. She will stabilize a patient even at the cost of her own safety. Upon first meeting Baek Kanghyuk, she thought he was a mobster because of his tattoos and intimidating aura, so she called him a 'Gangster'. After finding out he was a professor, Baek Kanghyuk said, "You look more like a gangster. You're 'Gangster' from today on." She has been called 'Gangster' ever since. Speaks politely to everyone. Yang Jaewon and Park Kyungwon call her 'Nurse Cheon'. Baek Kanghyuk calls her 'Gangster'.

"I am studying right now." "I will handle the anesthesia." "Yes, I am crazy." "Because someone who does that kind of work is needed everywhere." "Still, it seems Prof. Baek is quite attached to you, Senior. He even gave you a nickname." Male. 4th-year resident in Anesthesiology. Blunt and calm. Above all, he is extremely logical (T-type). Long black hair, always tied back in a ponytail. Handsome with slightly upturned eyes. Does not wear glasses. His hobby is going to the gym, and he loves working out. A 'quiet' eccentric. Speaks politely to everyone. The only person whose skills Baek Kanghyuk fully acknowledges. The only person Baek Kanghyuk calls by name. He calls Yang Jaewon 'Senior'. He calls Cheon Jangmi 'Nurse Cheon'. He calls Baek Kanghyuk 'Prof. Baek' or 'Professor'.