A new medical noir has set a 2026 ratings record in South Korea. The October 9 premiere of Doctor X: Age of the White Mafia pulled an 11.4% nationwide rating — the highest first-episode number of any miniseries aired this year. The SBS Friday-Saturday drama did not stop there: its second episode, which aired October 10, climbed even higher to 14.9%, making it the most-watched program on television that Saturday.
Nielsen Korea's figures behind the debut tell the story. The first episode averaged 11.2% in the Seoul metropolitan area and peaked at 12.9% in a single minute — good enough for the No. 1 premiere rating among all miniseries broadcast in 2026. In the advertiser-coveted 2049 demographic, the episode averaged 3.7% and peaked at 4.3%, ranking first not only among Friday programs but among every program aired that entire week.
The premiere also beat the show's own pre-air expectations. At the drama's press conference earlier in the week, director Lee Jung-rim had predicted a 9.21% premiere — a figure the actual 11.4% left well behind. The ratings surge suggests viewers showed up in force for Kim Ji-won's return to television after a two-year break from dramas.
Kim Ji-won stars as Gye Soo-jung, a mercenary surgeon dispatched from South Korea's first doctor-staffing agency to Guseo University Hospital. Armed with god-tier surgical skill and zero patience for hospital politics, Soo-jung has been billed as a medical dark hero taking on the corrupt power brokers the staff call the White Coat Mafia. Reviewing the premiere, Park Jin-young noted that Kim Ji-won's unrivaled charisma and passionate performance drew immediate praise.
The first episode wasted no time establishing its heroine's maverick streak. Spotting a stranger collapsing in a billiard hall, Soo-jung instantly diagnosed an inguinal hernia and performed emergency first aid. When wide-eyed intern Park Tae-kyung asked her name, she silently traced a giant X with her finger and walked away. On her first day at Guseo University Hospital, she called out the hospital director to his face, successfully completed a flawless surgery — and then clocked out at exactly 6 p.m., leaving the hierarchy in chaos behind her.
The supporting cast brings serious pedigree. Lee Jung-eun plays Jang Hee-sook, the sharp strategist who runs the doctor-dispatch agency and backs Soo-jung from behind the scenes. Kim Woo-seok plays Park Tae-kyung, the earnest intern and hospital heir whose view of medicine starts to crack under Soo-jung's influence. Son Hyun-joo plays Boo Seung-kwon, the hospital director trying to revive the struggling institution.
Behind the camera, the series is written by Pyeon Seong-geun and directed by Lee Jung-rim, the director known for the hit melodrama VIP. The 12-episode drama is a Korean remake of the hit Japanese series Doctor X, which ran for seven seasons on TV Asahi between 2012 and 2021 and starred Yonekura Ryoko as the mysterious freelance surgeon Daimon Michiko.
The momentum is clearly building. After the 11.4% premiere set the year's miniseries record, the October 10 second episode's jump to 14.9% made it Saturday's most-watched program overall, per IZE's ratings roundup — a rare case of a drama's audience growing rather than cooling after a hyped premiere.
For North American viewers, Doctor X: Age of the White Mafia is streaming on Netflix worldwide, with new episodes arriving the same day as the SBS broadcast. With the premiere record already broken and the second episode pulling even bigger numbers, the medical noir looks positioned to be one of the fall season's defining hits.
