Kim Ji-won's Doctor X Hits 17.4% by Episode 2, Topping Every Saturday Drama

Kim Ji-won's return to television after two years has landed with the kind of numbers that make other Friday-Saturday dramas look elsewhere. Doctor X: Age of the White Mafia opened on the 9th with a national average of 11.4% and a peak of 12.9%, already the highest debut rating for any miniseries airing this year. By the second episode on the 10th, it had climbed to 14.9% nationally and hit a peak of 17.4%, placing it at the top of every Saturday miniseries on air. The show's previous slot occupant, Chaebol X Detective 2, maxed out at 11.8% in its finale, a number Doctor X cleared in week one.

The 2049 demographic rating, which Korean broadcasters use as a gauge of advertiser-relevant buzz, averaged 4.6% in episode 2 with a peak of 5.4%, ranking first among all programs broadcast that entire week across every network.

The character driving the momentum

Kim Ji-won plays Gye Su-jeong, a freelance surgical gun-for-hire dispatched to Guseo University Hospital to fill a vacancy in its surgical department. The character's whole appeal is the refusal to play hospital politics: in episode 2, she physically dumps a VIP patient out of his wheelchair so she can rush an emergency case to the operating room. The hospital's senior surgeons respond by ordering an intern, Park Tae-gyeong (played by Kim Woo-seok), to shadow her every move. The episode closes on a tension-building reveal, surgeons researching a mysterious doctor known only as "Doctor X" find a surgical technique that matches Su-jeong's, along with a news report that a patient died two months after the operation, and a photo with Su-jeong's face in the frame.

It is Kim Ji-won's first medical drama, and her first lead role since Queen of Tears two years ago. That show was one of the biggest drama events of 2024, so the expectations here were not small. The performance in these first two episodes, sharp, a little reckless, and technically convincing, suggests she found the character's frequency quickly.

The series is adapted from the long-running Japanese TV Asahi drama Doctor X: Surgeon Michiko Daimon, which ran for multiple seasons and built a reputation for a similar kind of satisfying, anti-authoritarian wish fulfillment.

The accuracy debate nobody expected to go viral

Alongside the ratings conversation, a separate thread took off online after the show's medical consultant went public with an unusually candid admission. Dr. Namgung In, an emergency medicine physician and writer who disclosed on his Instagram Threads account that Doctor X marked his first time doing on-set advisory work, responded to a viewer asking whether he had actually signed off on the drama's medical content.

His reply: "Yes, I was the on-set consultant. If any medically incorrect scenes appear, please assume the consultant lost the argument with the production team."

Viewers had already been cataloguing specific complaints in online communities, questions about why a hernia patient whose condition had already resolved was rushed into emergency surgery, why an anesthesiologist wasn't administering epinephrine during a case with no readable blood pressure, and a separate frustration about a defibrillator scene that reportedly used an implausible joule setting. One commenter wrote that watching the monitor made them want to put their fist through the screen. The response to Dr. Namgung's comment was warmly sympathetic: several viewers replied that it sounded like he had "lost badly."

The accuracy complaints are a familiar companion to high-performing Korean medical dramas, and they rarely dent the ratings. At 17.4% and rising, Doctor X is not being slowed down by them. But the consultant's dry, self-deprecating transparency gave the story a second life online that the production probably did not plan for, and arguably made more people curious about watching.