Doctor X: Mafia in White

«Doctor X» is a dark medical drama centered on a brilliant surgeon who has gone into exile because of a dark past and who fearlessly takes on a corrupt world, relying solely on her extraordinary surgical skills.

Kim Ji-won plays Gye Su-jeong, a genius surgeon sent to reinforce the surgical department of Guseo University Hospital via the temporary doctors' agency run by Jang Hee-suk. In the operating room, Gye Su-jeong is a relentless surgeon who only lets her skills speak for themselves. Her role? To expose the excesses of the medical system, scalpel in hand.

Lee Jung-eun, a negotiator who thinks only about money

Lee Jung-eun plays Jang Hee-sook, the head of a physician recruitment agency whose main concern seems to be very simple: making money.

At first glance, the character may come across as an exuberant materialist who talks a lot. But this personality actually hides a formidable businesswoman, capable of using his people skills and cunning to conduct negotiations.

Behind her flamboyant exterior, then, lies a woman who knows exactly when to stop joking around.

Son Hyun-joo, a director torn between corruption and his medical duty

Son Hyun-joo performs Boo Seung-kwon, the director of a branch of Guseo University Hospital. His goal is clear: to prevent the hospital from falling into decline and to restore the prestige it has lost.

But in order to keep the institution afloat, he agreed to dealing with a corrupt system.

However, the character should not be portrayed as merely an antagonist. Despite the compromises he has made, Boo Seung-kwon still harbors the ambition to fulfill his duty as a doctor and to protect the hospital for which he is responsible.

Kim Woo-seok, a young, still-clumsy but determined intern

Park Tae-kyung (Kim Woo-seok) is taking his first steps at Guseo University Hospital with a lot of ambition… but still very little experience.

Described as kind, enthusiastic, and sometimes clumsy, the young doctor must quickly adapt to the grueling pace of life as an intern. The new footage shows him immersed in his work, trying to find his footing in an environment that will likely give him no breaks.

For behind the facade of a prestigious university hospital lies an institution rife with power struggles and corruption. Yet Tae-kyung seems determined not to lose the warmth and sincerity that define him. This attitude already sets him apart from certain doctors who are more concerned with their position in the hierarchy.

His previously relatively peaceful daily life is about to be turned upside down by the arrival of Gye Soo-jung. «The unique chemistry between Kim Ji-won, the cool-headed mentor, and Kim Woo-seok, her bright-eyed student, will be one of the highlights you won’t want to miss.»

Lee Jin-hee, Kim Young-min, Lee Sung-wook, Kwon Seung-woo, Heo Jun-seok, Choi Deok-moon, Kim Jung-young, Kim Young-ah, and Choi Kwang-il are also part of the cast.

Ratings: «Doctor X» Debuts with an 11.4 % Rating and Sets a Record in 2026

According to data from Nielsen Korea, the first episode of «Doctor X,» which aired on Friday, October 9, recorded an average national viewership rating of 11.4 %.

With these ratings, the drama starring Kim Ji-won has achieved the strongest debut of any miniseries aired in South Korea since the beginning of 2026. But that’s not all: «Doctor X» also emerged as the most-watched program on Friday, October 9, across all categories.

Episode 2: «Doctor X,» starring Kim Ji-won, is breaking records : After scoring an 11.4 % rating for its first episode, the series has already climbed to 14.9 1Q3Q for the second !

10/25/26: Episode 6 of «Doctor X» achieved a national viewership rating of 19.5 % according to Nielsen Korea, a new record for the series that makes it the most-watched program of the week and places it, tied with «The Penthouse 3,» to fifth place among the highest-rated episodes in the history of SBS Friday-Saturday dramas.

Aired on October 31, Episode 8 of «Doctor X» drew a national audience of 15.6 %, according to Nielsen Korea, remaining the most-watched program of the day across all channels.