“Doctor X” took aim at doctors chasing power and personal interests within the hospital, delivering a satisfying blow against corruption from its very first episode. At the center is Gye Su-jeong, a brilliant surgeon played by Kim Ji-won, in a rare female lead role for a medical drama. SBS' "Doctor X: Mafia in White," which premiered Friday, is a medical drama centered on Gye, also known as Doctor X, who takes on deeply rooted corruption with exceptional surgical skills and a refusal to accept failure or compromise. According to Nielsen Korea, the first episode recorded nationwide viewership of 11.4 percent and 11.2 percent in the Seoul metropolitan area, peaking at 12.9 percent. It was the highest-rated premiere among miniseries that debuted in 2026, giving "Doctor X" a double-digit start. The premiere introduced Gye, a temporary doctor dispatched to Guseo University Hospital, as she confronted the institution's hierarchy and corruption while demonstrating her surgical prowess. Gye and Jang Hee-sook, played by Lee Jung-eun, encountered a customer who suddenly collapsed in pain at a b