From Japan’s hospital hierarchies to Korea’s medical power struggles, here is the background that makes Kim Ji-won’s Doctor X easier to understand.
This post covers the basic setup and characters of Doctor X: Mafia in White. It does not reveal how the cases in Episodes 1–4 are resolved or any major twists.
Who is the most important person in a hospital?
The hospital director? A famous professor? Or the patient lying on the operating table right now? It sounds like an easy question, but in the hospital of Doctor X: Mafia in White, the answer keeps changing. Gye Sujeong (Gye Su-jeong), played by Kim Ji-won, is an outsider who walks into that hospital. She doesn’t play up to the professors, skips the after-work dinners, and demands to be paid what her skill is worth. And she says she doesn’t fail. She is a character from a medical drama Japan loved for more than a decade.
How Big Was Doctor-X in Japan?
The original is TV Asahi’s Doctor-X: Surgeon Michiko Daimon. It premiered in 2012, ran for seven TV seasons, and came to a close in December 2024 with the film Doctor-X the Movie. For more than ten years, it sat at the very top of Japanese television.
The numbers tell the story. Season 1 averaged a 19.1 percent rating, the highest of any drama on Japan’s commercial networks that year. Season 2 averaged 23.0 percent, and Season 3 averaged 22.9 percent, the top of every drama that year. Seasons 4 and 5 averaged 21.5 and 20.9 percent, and both finished the year as the No. 1 drama on the commercial networks. The Season 5 finale hit 25.3 percent. Even Season 6, when the average dipped, was the highest-rated drama of its quarter. In an era when dramas topping 20 percent had become rare, Doctor-X held the 20s season after season.
That’s why Korea chose to remake it. In Japan, Doctor-X was the kind of drama that defined an era, a show the whole country watched.
What Did the Japanese Original Take Aim At, and Why Did Japan Love It?
Michiko Daimon, played by Ryoko Yonekura, is a freelance surgeon who doesn’t belong to any university hospital’s ikyoku. She has two famous lines: “Itashimasen” (I won’t do it) and “Watashi, shippai shinai node” (Because I don’t fail).
The ikyoku is an organization unique to Japanese university hospitals. The professors and doctors of a single department are bound together like one family, with the head professor at the top, and everything from training and patient care to personnel decisions is decided inside it. Which hospital a doctor works at and how far they rise was in the professor’s hands. Cross the people above you, and your whole career could be shaken. Inside that system, lining up behind the right person counts for more than skill, and the professor’s pride comes before the patient.
Michiko stands outside all of it. With no professor’s favor and no faction behind her, she signs contracts on the strength of her surgical skill alone. That’s why she can say “I won’t do it.” She refuses the after-work dinners, refuses to ghostwrite professors’ papers, refuses to flatter her superiors. And then she performs the surgeries no one else can.
I think the reason this drama was so loved in Japan lies outside the hospital. Japan is a society where hierarchy and the pressure to read the room, what the Japanese call kuuki wo yomu, “reading the air,” run unusually deep. For office workers who swallow what they want to say and spend their days guessing what their bosses want, Michiko saying “I won’t do it” to her superiors was pure wish fulfillment. On top of that, she isn’t a regular employee. She is a freelance surgeon hired through a placement agency. It’s the story of someone who belongs to no organization beating the organization with nothing but her skill. Japanese viewers cheered that scene even more than the surgeries.
What Did the Korean Version Turn Into Korea’s Own Problems?
Director Lee Jung-rim has said the remake respects the backbone of the original while reinterpreting it to fit Korean sensibilities, taking into account the differences in setting and systems.
The Korean version also shows a doctors’ office, called a uiguk in Korean, but it looks quite different. It’s a room where doctors handle paperwork and take breaks, more like a college club room. With a different culture, the Korean version doesn’t carry over the Japanese-style hierarchy as it is. From Episode 1, its target is clear. It isn’t the hierarchy inside a department office. It’s the power Korean doctors as a group hold in Korean society.
Doctors’ Authoritarianism and Sense of Superiority
Episode 1 opens at a celebration held by the Magnolia Society, a private club of doctors. They raise their glasses and shout, “To the white coat!” But what binds them together is not their patients. It’s their own status. The hospital director brags about a surgical technique he named after himself, and professors talk down to a fellow specialist from outside in banmal, the casual speech Koreans use with juniors and close friends, a clear slight. In Korea, doctors are considered the elite of the elite. The drama relentlessly shows the moment that elitism turns into authority lording it over patients. Of course, not every doctor is like this. But to Korean viewers, these scenes are all too familiar.
Doctors Chasing Political Power
What the Magnolia Society is celebrating isn’t a successful surgery. It’s one of its members being elected mayor. And they say that’s only the beginning. The sight of doctors reaching beyond the hospital to expand their influence over local politics and policy overlaps with the reality of Korean doctors’ organizations, which have clashed with the government again and again over healthcare policy. In fact, the Korean Medical Association has raised its voice forcefully toward politicians every time healthcare policy has shifted, and has faced criticism along the way for putting the group’s own interests first. If Japan’s Michiko fought the power inside the hospital, Korea’s Sujeong faces power that reaches far beyond it.
What Happened Inside the Operating Room?
The Magnolia Society talks about the law requiring CCTV in operating rooms as an ordeal they had to endure. Since September 25, 2023, Korean medical institutions that operate on patients who are unconscious, such as under general anesthesia, have been required to install CCTV in their operating rooms. Filming happens when the patient or a guardian requests it. The law grew out of cases of ghost surgery, where someone other than the agreed-upon surgeon operated, and other medical malpractice. A patient under anesthesia has no way of knowing what happened inside the operating room. The very demand for cameras shows how much distrust exists between patients and doctors.
Who Fills the Empty Seats?
Another phrase the Magnolia Society brings up is “the fight against expanding medical school admissions.” In February 2024, the Korean government announced it would increase medical school admissions by 2,000, and trainee doctors walked out of hospitals en masse, leaving gaps in patient care. Many trainee doctors returned in 2025, and admissions for the 2026 school year went back to pre-increase levels, but in the end, it was patients who bore the gap. In the drama, too, Guseo University Hospital is falling apart as doctors and nurses leave. That’s why it needs a mercenary surgeon like Sujeong.
How Is Gye Sujeong Different from Michiko Daimon?
The two characters share the same roots. They aren’t tied to any organization, they’re confident in their skill, and they don’t back down in front of authority. In the Korean version too, “I won’t do it” and “I don’t fail” sum up who Sujeong is.
What differs is the direction of their charisma. Ryoko Yonekura’s Michiko is flamboyant. She loves fashion, doesn’t hide her self-assurance, and owns any room the moment she walks in. Kim Ji-won’s Sujeong doesn’t need to raise her voice. She answers briefly, keeps her expressions minimal, and turns people down flatly. If Michiko’s confidence radiates outward, Sujeong’s is packed tightly inside. Kim Ji-won has said she wanted to strip away the glamorous look of her previous drama, Queen of Tears, this time.
The center of gravity of the story is different, too. If the engine of the original is how Michiko will overturn the hospital’s order, the Korean version also puts weight on Sujeong’s past. Director Lee Jung-rim explained that because Sujeong’s past is revealed as the story goes on, they needed an actor who could play both her past and present. That’s why the same words, “I don’t fail,” sound as if Sujeong has her own reason for needing to say them.
Just Remember This Before You Watch
You don’t need to watch the Japanese original first. Just keep two things in mind.
The Japanese original took aim at the hierarchy of the university hospital ikyoku, and office workers trapped in hierarchies of their own cheered for a genius surgeon who stood outside the organization. The Korean version takes aim at doctors’ authoritarianism and political power, showing how patients are left to bear the resulting distrust and gaps in care. If “I won’t do it” was aimed at the boss in Japan, in Korea it’s aimed at the power the white coat has built up.
Keep those two critiques in mind, and you’ll see exactly what the Korean Doctor X is trying to say. For a character-by-character comparison of the original and the Korean version, see our Doctor X Korean vs. Japanese comparison.
Basic Info
- Official English title: Doctor X: Mafia in White
- Korean title: 닥터X: 하얀 마피아의 시대 (Dakteo X: Hayan Mapiaui Sidae)
- Genre: Medical drama, medical noir
- Premiere: October 9, 2026
- Director: Lee Jung-rim
- Writer: Pyeon Seong-geun
- Based on: The Japanese TV Asahi series Doctor-X: Surgeon Michiko Daimon
- Main cast: Kim Ji-won (Gye Sujeong), Lee Jung-eun (Jang Heesook), Son Hyun-joo (Bu Seunggwon), Kim Woo-seok (Park Taekyung)
- Guide scope: Basic setup, characters, and background from Episodes 1–4; case resolutions and major twists are not revealed.
- Where to watch: SBS in South Korea; Netflix in available regions. Availability varies by country.
More from Doctor X
Doctor X Korean vs. Japanese: How the Original Ends, and Will There Be a Season 2?
Doctor X Episode 1 Recap: The Mercenary Surgeon Who Refuses to Run with the Pack
Doctor X Episode 2 Recap & Analysis: Two Surgeries, One Hour, Everyone Stunned
Doctor X Episode 3 Recap & Analysis: When Staff Die on the Job, Who Is Responsible?
Doctor X Episode 4 Recap & Analysis: What Does D.N. Mean?
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