'Doctor X: Mafia in White': Kim Ji-won Discovers Initials 'DN' Carved on Patient's Organ During Surgery—What Does It Mean?

By  Kim Hyo-jung  | Oct 18, 2026

'Doctor X: Mafia in White': Kim Ji-won Discovers Initials 'DN' Carved on Patient's Organ During Surgery—What Does It Mean?
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The October 17 broadcast of the SBS Friday-Saturday drama "Doctor X: Mafia in White" (hereinafter "Doctor X") portrayed Gye Soo-jung discovering Na Dae-il's secret.

On this day, Gye Soo-jung performed surgery to save Kwon Choong-hyun, who had collapsed from cholecystitis.

Kwon Choong-hyun, a pharmaceutical company employee, drew attention as his special relationship with Na Dae-il came to light. In fact, he had been bullied by senior soldiers during his past military service and had been on the verge of losing his life.

It was revealed that Na Dae-il, who was a military doctor at the time, saved him through surgery and even testified before a military committee against those who had tormented Kwon Choong-hyun. Furthermore, it caught viewers' attention that Kwon Choong-hyun was deeply moved by Na Dae-il's grace and had started working in the medical industry to be closer to him.

However, even though Kwon Choong-hyun, who shared such a close bond with him, was suffering from severe cholecystitis, Na Dae-il treated it as if it were someone else's problem. And despite the medical team's opinion that surgery was urgent, Kwon Choong-hyun said he could not undergo surgery immediately due to his sales work, creating a heartbreaking situation.

Na Dae-il, who had gained the trust of the Mokryeon Society, approached Gye Soo-jung for some reason and asked her to have a meal together. To this, Gye Soo-jung said, "I don't socialize. And patient Kwon Choong-hyun won't last until Monday."

At the same time, Gye Soo-jung asked Na Dae-il if he had looked at Kwon Choong-hyun's scan. When Gye Soo-jung pointed out that there was something strange on his liver, Na Dae-il replied, "That's probably just adhesions formed as traces from the surgery 15 years ago clumped together."

To this, Gye Soo-jung remarked, "That's just a guess," and Na Dae-il said, "It won't be a tumor or anything like that." Gye Soo-jung replied, "We'll only know once we open him up."

Despite what Gye Soo-jung said, Na Dae-il brought up her surgeries. He asked, "You seemed like a god. Or maybe a monster? People say you only look ahead, so I wondered what's in front of you. Or is it behind you? What is there that makes you only look forward?" but Gye Soo-jung walked forward without offering any answer.

And just as Gye Soo-jung had predicted, Kwon Choong-hyun could not hold out until Monday. Kwon Choong-hyun was rushed to the hospital on Friday. At that time, Na Dae-il was socializing with the Mokryeon Society.

The hospital notified Na Dae-il that Kwon Choong-hyun had been brought in. However, Na Dae-il pushed the surgery off to another doctor, only reacting when he heard that Gye Soo-jung would be performing the surgery and would perform open surgery due to severe adhesions.

Na Dae-il headed straight to the hospital, and Gye Soo-jung began the open surgery without any hesitation. Then, Gye Soo-jung discovered the initials "DN" written on Kwon Choong-hyun's liver, raising curiosity about what had happened to him 15 years ago.
※ Please note: This article was translated by AI and may contain errors.