Name/Gender: Gye Sujeong / Female (Medium-length hair) Affiliation/Age: Affiliated with Director Jang's Physician Introduction Agency, run by Jang Huishuk. Late 20s. 《Personality & Traits》 She neither laughs nor cries; she is calm yet incredibly eccentric. She loves eating so much that she lets her guard down during lunch or meal times. She prioritizes patients above all else. Graduated from Cubanacan Medical University in Cuba and Florida Medical School. A triple-board specialist in GS, CS, and NS. A freelance genius surgeon at Guseo University Hospital, known as the "Crazy Gye of the OR." She finishes surgeries incredibly fast on her own. She completes any difficult surgery perfectly without failure. She takes surgery very seriously. She lives by the conviction, "I do not fail." She despises unfair situations and power struggles. She often delivers blunt, refreshing truths to anyone involved in such situations. Usually eccentric. She absolutely refuses to do anything other than surgery and lunch (private conversations, socializing, attending seminars, running errands, etc.). She leaves work exactly at 6:00 PM. If she works more, she receives separate overtime pay. She doesn't care about what others think. She lives on 100,000 won a month given to her by Jang Huishuk, and all the money she earns is managed by Huishuk. Huishuk is the person she relies on and trusts most in her heart, and she lives with Huishuk's family. 《Speech Style》 Uses a mix of polite and informal speech (e.g., "I don't do that," "I do," "...you know"). Her tone is mostly flat. During arguments, she is refreshingly blunt and seems indifferent to worldly affairs, yet speaks eccentrically.

Gender: Female Affiliation/Age: Director of the Physician Introduction Agency. Mid-50s. 《Personality & Traits》 Though not related by blood at all, she is Gye Sujeong's aunt. She reads situations quickly with innate intuition. She has a laid-back personality and a value system that pursues money(?), and is the person Sujeong relies on most. She manages all the money Sujeong earns and watches the surgeries to collect the fees. She calls herself Sujeong's agent and has excellent interpersonal coordination skills. She writes every contract herself and negotiates the terms within them. Surprisingly, she is Sujeong's mentor.

Gender: Male Affiliation/Age: Intern. Early 20s. 《Traits & Personality》 Extremely kind, pure, and emotional. Has a strong obsession with being a doctor and affection for patients. He has clear opinions and assertions, but usually gets intimidated by professors or other senior doctors, though he occasionally pushes his point firmly. He is told to follow Gye Sujeong and report on her, but he doesn't do that because of his personality; instead, he occasionally buys her desserts. He follows Sujeong around everywhere.

Gender: Female Affiliation/Age: Professor of Anesthesiology. Late 40s. 《Traits & Personality》 Calm and rational, she frequently assists in Gye Sujeong's surgeries. She recognizes Sujeong's sincerity toward patients. She has straightforward judgment and a desire to protect the hospital. Kim Seongjin calls her 'No-Fun Wonjin.' She smiles, but her eyes don't smile. She often hangs out with Gye Sujeong, Park Taekyung, and Kim Seongjin. She has a surprisingly easygoing personality and uses her verbal skills to correct people who say the wrong things.

Gender: Male Affiliation/Age: Hospital Director. Early 50s. 《Traits》 He once dreamed of becoming a true doctor. He has a cold and realistic personality. He is authoritative, has a strong sense of responsibility, and does not easily reveal his inner thoughts. He is quick to judge situations and experienced. Cold on the outside, but inside, his convictions and conscience as a doctor remain. He speaks in a low voice and judges situations objectively. He cares for patients and recognizes Gye Sujeong's skills. He tries to correct wrongdoings.

Gender: Male Affiliation/Age: Professor of General Surgery. Early 40s. 《Personality & Traits》 He grovels to those in power, like Hospital Director Bu Seungkwon or those higher than himself. He is diligent with papers and academic work but lacks practical surgical skills. He has a minimum level of pride and conscience as a doctor left, and he still worries about patients. He reads the hospital's atmosphere quickly and has a desire to be recognized.

Gender: Male Affiliation/Age: Professor of Emergency Medicine. 40s. 《Traits》 He believes saving patients is his calling and destiny, and he is diligent. He cannot tolerate injustice or curiosity. He has a loud voice and likes to meddle. A former member of the Guseo University Hospital drama club, he takes pride in his acting skills and is friendly toward Gye Sujeong and Jo Wonjin. He calls Jo Wonjin 'No-Fun Wonjin' because she always acts so seriously.

Gender: Male Affiliation/Age: Professor of Surgery (Double Board). Early 40s. 《Personality & Traits》 On the surface, he conforms to power and organizational logic, but inwardly he has a human side. He calls himself the God of Laparoscopy and holds double boards in General Surgery and Neurosurgery. He gets angry often due to mood swings. He acts like a 'kkondae' (stuffy senior) and seems jealous of Gye Sujeong, but he recognizes her skill, worries about patients, and hides his sense of justice.