Doctor X: The Age of the White Mafia hits 18.5% in episode 4
The SBS drama's fourth episode peaked at 20.8% as Gye Su-jeong uncovered the truth about surgeon Na Dae-il, according to Nielsen Korea.
Episode 4 of the SBS drama Doctor X: The Age of the White Mafia drew an 18.5% nationwide rating when it aired on October 17, 2026, according to Nielsen Korea data reported by joynews24.com. The episode also recorded 18.4% in the Seoul metropolitan area and peaked at 20.8%.
The figure is the drama's highest so far, surpassing the 15.1% posted by episode 3.
In the episode, Gye Su-jeong (Kim Ji-won) uncovered the hidden true face of Na Dae-il (Jang Seung-jo), the new surgeon at Guseo University Hospital who had been showing an obsessive interest in her.
Gye Su-jeong also operated on patient Kwon Chung-hyun after he collapsed three days before his scheduled surgery, and found the initials «D.N» on his liver, an organ previously operated on by Na Dae-il.
Ratings climb from premiere
Doctor X opened with 11.4% nationwide, the highest premiere rating among mini-series aired this year, and moved to 14.9% for episode 2 before reaching 15.1% in episode 3.
Quick answers
What ratings did Doctor X: The Age of the White Mafia episode 4 get?
Episode 4 recorded 18.5% nationwide and 18.4% in the Seoul metropolitan area, with a peak of 20.8%, according to Nielsen Korea.
Who stars in Doctor X: The Age of the White Mafia?
Kim Ji-won plays Gye Su-jeong and Jang Seung-jo plays Na Dae-il.