“Doctor X: Mafia in White” Episodes 9–10: Jang Hui-suk's Shocking Secret and Another Doctor X Twist!
Who knew the woman managing Gyu Su-jeong's career was actually the surgeon who helped make her a medical genius?
Doctor X: Mafia in White finally answers one of its biggest mysteries in Episode 9, revealing Jang Hui-suk's true identity as Su-jeong's surgical mentor. But Episode 10 takes that revelation to another level, bringing the two women together in an extraordinary operation that saves a young girl's life.
And just when we thought the drama had delivered its biggest surprise, the final moments introduce another mysterious connection from Su-jeong's past.
Between a nearly impossible cancer operation, a hospital rebellion, a mentor stepping back into the operating room, and a shocking encounter with a patient who calls Su-jeong "Doctor X", Episodes 9 and 10 give viewers plenty to unpack.
Here's why these two episodes may be a turning point for the entire series.
*Contains Spoilers!
Jang Hui-suk's Secret Is Finally Out: She's the Woman Who Trained Doctor X!
For much of the series, Jang Hui-suk (Lee Jung Eun) has appeared to be Su-jeong's business manager and the person responsible for arranging her hospital placements.
She's been there to negotiate, protect Su-jeong's interests, and occasionally deal with the consequences of her unconventional approach to medicine.
But Episode 9 completely changes our understanding of their relationship.
When an eight-year-old cancer patient needs an extraordinarily complicated operation, Su-jeong (Kim Ji-won) finds herself desperately short of experienced medical support. The hospital is caught in a doctors' strike, and most of the available staff are unwilling to participate in her high-risk surgical plan.
As the patient's condition deteriorates, Hui-suk enters the operating room wearing surgical scrubs.
Then Su-jeong introduces her to the team as her mentor.
Yes, the woman who has been managing Doctor X's career is actually the surgeon who taught her!
It's a fantastic reveal because it gives Hui-suk an entirely different purpose in the story. She's not simply protecting a talented doctor from hospital politics. She's someone who helped develop Su-jeong's surgical abilities and understands the extraordinary surgeon she has become.
Suddenly, their previous interactions make much more sense.
Hui-suk's concern about Su-jeong's career, her frustration with her decisions, and her willingness to protect her from professional consequences all take on a deeper meaning.
But the biggest question is why someone with Hui-suk's surgical experience has spent so much time working behind the scenes instead of operating herself.
Episode 10 gives us a little more insight into that history.
The 2014 Flashback That Makes Their Relationship Even More Special
One of the most touching moments surrounding the reveal comes through a flashback to 2014.
Su-jeong is supposed to graduate from medical school and take her professional oath, but she's so absorbed in observing surgery that she misses her own graduation ceremony.
When Hui-suk and Eung-gu find her asleep at her desk, Hui-suk is understandably frustrated.
But rather than let the occasion pass, she arranges a small graduation ceremony at home so Su-jeong can take the Hippocratic Oath.
They even take a photograph together.
It's a small but meaningful scene that shows just how much Hui-suk has invested in Su-jeong's future.
Episode 10 takes that relationship further by revisiting Hui-suk's advice from their time in Lagota: always stand by your patients, regardless of the circumstances.
She remembers a previous heart transplant operation when she rushed into the operating room carrying a donor heart despite being injured, determined to help Su-jeong.
That memory becomes especially important when Hui-suk makes the decision to help her former student again.
This time, the patient is little Hyeon-a, and the operation is one that could easily become the most difficult of Su-jeong's career.
Episode 9's Cliffhanger: An Eight-Year-Old Girl's Life Is on the Line
While Hui-suk's identity is the biggest character revelation, the medical emergency is what brings everything together.
Eight-year-old Lee Hyeon-a is suffering from an aggressive abdominal tumor involving multiple organs.
Su-jeong proposes an extremely complicated procedure that requires temporarily removing six organs, extracting the tumor outside the body, and reconnecting and transplanting the organs.
It's a high-risk operation estimated to take approximately 15 hours.
The problem? The hospital is severely short-staffed because of the ongoing doctors' strike.
Su-jeong needs an experienced surgical team, but the medical staff is divided over whether they should participate.
The hospital's senior doctors also raise concerns about the lack of Institutional Review Board (IRB) approval.
Su-jeong knows the risks. She even submits her resignation letter to protect Hui-suk's agency from the potential consequences if the operation fails.
But she refuses to abandon Hyeon-a.
When the operation finally begins, the situation becomes increasingly frightening. Hyeon-a's blood pressure drops, and the team struggles to stabilize her.
Dr. Do Yun-sik eventually leaves the doctors' meeting to join the surgical team.
Then Hui-suk arrives.
Episode 9 ends with the mentor stepping into the operating room just when Su-jeong needs her most.
It's a cliffhanger that makes Episode 10 almost impossible to wait for.
Episode 10: The Mentor and Student Finally Operate Together
Episode 10 picks up with Hui-suk joining Su-jeong and the rest of the surgical team.
And this is where the mentor reveal becomes more than just an interesting piece of backstory.
Hui-suk puts her surgical experience into action, working alongside Su-jeong, Dr. Do, Tae-kyeong, and Won-jin.
Meanwhile, Director Bu makes his own decision to abandon the doctors' strike proceedings and head to the operating room. Dr. Bae also joins the effort, and the medical team gradually comes together.
The hospital's leadership is furious that the doctors are ignoring the strike and proceeding with an operation that hasn't received IRB approval.
Chairman Kim, Mr. Gu, and Mayor Im arrive to challenge the doctors and demand that the procedure be stopped.
But Director Bu refuses to back down.
He believes saving Hyeon-a is more important than the political battle taking place inside the hospital.
As the operation continues, Seong-jin also arrives to help with the procedure.
The doctors begin placing Hyeon-a's organs back into her body after removing the cancerous growth. Everyone watches closely as they wait for the organs to regain their healthy pink color, indicating that blood circulation has returned.
And then comes the moment everyone has been waiting for.
The operation succeeds!
Su-jeong completes the final stitches, and the surgical team finally gets the news they desperately wanted.
Hyeon-a has been saved.
The emotional relief is especially noticeable among the doctors who put their careers on the line to help her.
But Su-jeong's reaction to the successful operation is what makes this moment particularly meaningful.
When the doctors ask her to perform her familiar post-surgery ritual of placing her hand over the patient's heart, she does something unexpected.
Instead of placing her own hand there, she takes Hui-suk's hand and places both of their hands on Hyeon-a's chest.
Think about the symbolism.
The woman who helped teach Su-jeong how to become a surgeon is now standing beside her after they have successfully saved a child's life.
It's a beautiful acknowledgment of their relationship, and arguably one of the most satisfying moments across these two episodes.
Hui-suk Isn't Finished Protecting Su-jeong: Her Next Move Is Brilliant!
Just when viewers think the medical crisis is over, the hospital's political problems return.
The doctors who participated in Hyeon-a's operation are immediately threatened with disciplinary action.
Su-jeong's freelance contract with GUMC is terminated, while the other doctors face suspensions and professional consequences for going against the strike.
Director Bu is particularly targeted, with the Magnolia Society determined to punish those who defied its authority.
But Hui-suk isn't about to let the people who helped save Hyeon-a be destroyed for doing their jobs.
She arrives at the disciplinary meeting with Hyeon-a's mother, who threatens to take legal action against GUMC and the Guseo Foundation if the doctors are punished.
Her argument is straightforward: if the hospital wants to hold Su-jeong responsible for performing a high-risk operation without IRB approval, then the foundation should also be held accountable for allowing the situation to happen.
It's a clever counterattack.
The Magnolia Society representatives suddenly find themselves facing a potential legal and public-relations disaster.
The disciplinary measures are put on hold.
Once again, Hui-suk demonstrates that she's much more than someone who arranges Su-jeong's next medical assignment.
She knows how to navigate the hospital's power structure, and she's clearly willing to use that knowledge to protect the people she cares about.
The woman who taught Su-jeong how to operate may be just as formidable outside the operating room.
Another Shocking Doctor X Mystery: Who Is Kim Seung-hyo?
Just when Episode 10 seems ready to wrap up the Hyeon-a storyline, the drama introduces another major mystery.
A familiar figure named Kim Seung-hyo, founder of the medical volunteer organization White Wings, is arriving at GUMC from the United States for a heart transplant.
His arrival immediately gets Hui-suk's attention, and his connection to the hospital raises questions for the other doctors.
Director Bu eventually discovers that Seung-hyo specifically requested GUMC for his operation because his guardian, Won-jin, and his preferred surgeon, Su-jeong, are all there.
But the real shock comes in the episode's epilogue.
Tae-kyeong is seen attempting to smother Seung-hyo with a pillow while Won-jin watches.
Su-jeong rushes in to intervene, but Seung-hyo grabs her hand and delivers a line that changes the entire mood of the ending:
“Long time no see, Doctor X.”
Wait. What?
How does Seung-hyo know Su-jeong by that name? What is their history, and why does Tae-kyeong appear to be trying to stop him?
After spending two episodes learning about Hui-suk's connection to Su-jeong, we're suddenly faced with another person who seems to know something about the mysterious surgeon's past.
And this time, the implications could be even bigger.
Three Big Questions We Have After Episodes 9 and 10
The mentor reveal and successful surgery give us plenty to celebrate, but the drama has opened several new storylines that deserve attention.
1. What happened between Su-jeong and Kim Seung-hyo?
His recognition of "Doctor X" suggests a history that viewers haven't been told about yet. Is he a former patient, a colleague, or someone connected to Su-jeong's medical past in a much more complicated way?
2. Why was Tae-kyeong trying to stop Seung-hyo?
The attempted suffocation scene is one of the most shocking moments of Episode 10. What does Tae-kyeong know about this patient, and why does he appear so determined to stop him?
3. Will Hui-suk become a more active part of Su-jeong's medical team?
Now that viewers know she's an experienced surgeon and Su-jeong's mentor, we'd love to see more of her operating alongside Doctor X. Their relationship could become one of the strongest parts of the drama.
Dojeon Media Verdict: The Mentor Reveal Was Just the Beginning!
Episodes 9 and 10 deliver a satisfying combination of emotional character development and high-stakes medical drama.
Jang Hui-suk's identity reveal is the standout moment because it changes how we understand Su-jeong's journey. We've spent the series watching a brilliant surgeon challenge hospital authority and take on seemingly impossible operations. Now we finally see the person who helped shape her into that doctor.
But Episode 10 makes the reveal even better by allowing the mentor and student to work together when a young patient's life is at stake.
Their shared moment with Hyeon-a after the successful surgery is a reminder that medicine isn't always about individual brilliance. Sometimes it's about the people who stand beside you when everything is on the line.
And then the drama throws another mystery at us.
Kim Seung-hyo's arrival and his recognition of "Doctor X" suggest that Su-jeong's past is far from finished catching up with her.
Our verdict? Jang Hui-suk may have been the biggest surprise of Episode 9, but Kim Seung-hyo could be the mystery that changes everything in the episodes ahead.
We're officially ready for the next chapter of Doctor X!
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