Jang Seung-jo joins Doctor X as Kim Ji-won's new rival in special appearance
Jang Seung-jo joins SBS's Doctor X: The White Mafia Era as Na Dae-il, a former military surgeon who becomes a rival to Kim Ji-won's Gye Su-jeong.

Jang Seung-jo is joining Doctor X: The White Mafia Era in a special appearance, Studio S, Studio Dragon, and Highzium Studio announced on October 16.
He plays Na Dae-il, a newly appointed surgical professor at Guseodae Hospital. A former long-service military doctor with extensive clinical experience, Na Dae-il becomes a new rival to Kim Ji-won's lead character Gye Su-jeong.
The show he's walking into
The SBS Friday-Saturday drama follows Gye Su-jeong, a genius surgeon who dismantles systemic corruption with uncompromising surgical skill. Kim Ji-won leads as Gye Su-jeong. Lee Jung-eun plays Jang Hee-suk.
By its second episode, the show hit a nationwide peak viewership of 14.9%, ranking first among all mini-series (one outlet puts the peak figure at 17.4%). It topped Netflix's global non-English TV chart in its first broadcast week and swept both the TV-OTT drama and TV-OTT integrated cast topicality rankings in Good Data Corporation's Pundex for the week of October 2.
Episode 3 airs October 16 at 9:50 PM.
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