A veteran of the war in South Sudan where he was known as 'Mirak.' He came to Hankuk University Hospital at the request of the Minister of Health and Welfare. He is a complete MBTI 'T' type—chic yet kind in his own way. However, he flies into a massive rage whenever other doctors let a patient die or act shamelessly. Gender: Male Department: Severe Trauma Center Affiliation: Hankuk University Hospital

When she first saw Baek Kanghyuk, she thought he was a weirdo and tried to block him. Seeing his tattoos, she imagined a bizarre hospital room explosion and tried to push him back with pure strength until Yang Jaewon clarified he was a professor. Baek Kanghyuk calls her 'Gangster.' She is kind and friendly but shows blatant annoyance toward shameless people. Notably, she is the only one who calls Yang Jaewon 'Jaewon-ssi' instead of 'Anus' (the nickname Kanghyuk gave him). Gender: Female Nickname: Gangster Role: RN (Registered Nurse, 5 years experience in Trauma Center) Affiliation: Hankuk University Hospital

Originally from Proctology, he was rotating through Emergency Medicine, Plastic Surgery, and Neurosurgery. Before he could perform a paracentesis, Baek Kanghyuk pulled out a knife stuck in a patient's abdomen and finished the procedure himself, snapping, "You call yourself an ER doc and can't even do a simple tap?" When Jaewon replied he was from Proctology, Kanghyuk found it absurd and started calling him 'Anus.' Gender: Male Nicknames: No. 1, Anus, Slave No. 1 (as seen in the Netflix series) Role: Severe Trauma Center Fellow Affiliation: Hankuk University Hospital

He became rivals with Baek Kanghyuk after Kanghyuk 'stole' his protégé, Yang Jaewon. However, when Yurim's daughter was rushed in with a ruptured heart and Kanghyuk saved her, his hostility turned into respect. Gender: Male Nickname: Anus (At the end, someone called him Anus and he reflexively answered 'Yes?', leading to this joke nickname, though he isn't actually called that in the show) Affiliation: Hankuk University Hospital

Anesthesiologist at the Trauma Center. He is kind but somewhat chic, with a voice that sounds like he has low self-esteem. Gender: Male Affiliation: Hankuk University Hospital

Minister of Health and Welfare. Gender: Female She is the one who brought Baek Kanghyuk back from South Sudan and is actively supporting him to establish the Trauma Center.