Mary Kills People episodes 3 and 4, which aired on August 8-9, 2025, delivered explosive revelations and heart-stopping moments that left viewers on the edge of their seats. Lee Bo-young’s Woo So-jeong finally discovers that her “terminal cancer patient” Cho Hyeon-u is actually an undercover detective, setting up a dangerous cat-and-mouse game that threatens everything she’s worked for.
Table of Contents
Mary Kills People Episodes 3-4: Key Details
| Aspect | Details |
|---|---|
| Air Dates | August 8-9, 2025 |
| Episode Focus | Identity revelation and undercover operation |
| Major Twist | Cho Hyeon-u revealed as Detective Pan Ji-hun |
| Key Plot Points | Police sting operation, drug dealer involvement |
| Patient Helped | Cho Su-yeong (terminally ill high school student) |
| Broadcast Schedule | MBC TV, Fridays & Saturdays at 10 PM KST |
| Next Episodes | Episodes 5-6 airing August 15-16, 2025 |
Episode 3: The Undercover Mission Unfolds
Episode 3 opens with a crucial flashback revealing Cho Hyeon-u’s true identity. Three months earlier, former detective Pan Ji-hun (Lee Min-ki) had been demoted to traffic police duty when his former colleagues approached him with an undercover mission to gather evidence against Woo So-jeong.
The Police Sting Operation
Initially reluctant, Hyeon-u accepts the mission when he learns powerful figures are backing the operation. He assumes the identity of dying man Cho Hyeon-u and strategically approaches So-jeong for help with euthanasia.
The police create an elaborate fake home for Hyeon-u, staging it as his favorite place to lure So-jeong into performing euthanasia there. However, their carefully laid plans begin to unravel when So-jeong receives a phone call revealing that the real Cho Hyeon-u has died.
So-jeong’s Narrow Escape
Realizing something is amiss, So-jeong grows suspicious and notices the police van stationed nearby. She manages to escape, destroying the last remaining drug ampule in the process. This setback forces her to make a dangerous deal with drug supplier Go Kwang-cheol to obtain new ampules.
Episode 4: Escalating Dangers and New Threats
Episode 4 intensifies the drama as So-jeong faces multiple threats from different directions. The police raid her hospital under a different case, with Hyeon-u directly confronting her and warning her to stop her euthanasia activities or face arrest for murder.
The Drug Dealer’s Blackmail
Go Kwang-cheol, who provided So-jeong with new ampules, reveals his sinister side by forcing her to strip at gunpoint and taking compromising photos as leverage. This vulnerability puts So-jeong in an increasingly precarious position.
Hospital Hostage Situation
The episode climaxes when wounded drug dealer Gim Si-hyeon is brought to So-jeong’s hospital. Under blackmail from Go Kwang-cheol, So-jeong is forced to help Gim escape by staging a hostage situation, holding scissors to her own neck while leading him to safety.
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Character Development and Moral Complexity
Woo So-jeong’s Dilemma
Lee Bo-young masterfully portrays So-jeong’s growing desperation as she navigates between her mission to help terminally ill patients and the mounting pressure from law enforcement and criminals alike. Her character’s moral complexity deepens as she makes increasingly dangerous choices.
Detective Hyeon-u’s Internal Conflict
Lee Min-ki’s performance shows Hyeon-u struggling with his undercover role, especially after witnessing So-jeong’s genuine compassion for her patients. His character’s backstory, including memories of his senior officer’s suicide, adds emotional depth to his pursuit of So-jeong.
Critical Plot Developments
- Identity Crisis: The revelation of Hyeon-u’s true identity fundamentally changes the dynamic between the leads
- Police Pressure: Increased law enforcement attention threatens So-jeong’s operation
- Criminal Involvement: Drug dealers complicate So-jeong’s already dangerous work
- Personal Stakes: Family tensions with Ryu I-su add emotional weight
Stay updated on the latest K-drama developments and episode analyses at TechnoSports.
What Episodes 3-4 Mean for the Series
These pivotal episodes establish the central conflict that will drive the remainder of the series. With So-jeong now aware that Hyeon-u is an undercover detective, the psychological chess match between them becomes the show’s primary focus.
The introduction of criminal elements through Go Kwang-cheol and Gim Si-hyeon adds another layer of danger, forcing So-jeong to make increasingly desperate choices that could compromise her moral mission.
Looking Ahead to Episodes 5-6
With So-jeong now trapped in a car with dangerous criminals and her cover potentially blown, episodes 5-6 promise even more intense developments. The series continues to air every Friday and Saturday at 10 PM KST on MBC TV, with the next episodes scheduled for August 15-16, 2025.
Watch Mary Kills People on MBC TV every Friday and Saturday at 10 PM KST. Follow episode discussions on MyDramaList and check cast updates on IMDb.
Frequently Asked Questions
Q1: Does Woo So-jeong discover Cho Hyeon-u’s real identity in episodes 3-4?
A: Yes, Woo So-jeong discovers that Cho Hyeon-u is actually Detective Pan Ji-hun working undercover. She becomes suspicious when she receives a call informing her that the real Cho Hyeon-u has died, realizing that the man she’s been helping has been using a false identity to investigate her euthanasia activities.
Q2: What major plot developments happen in Mary Kills People episodes 3-4?
A: Episodes 3-4 feature several major developments: the revelation of Hyeon-u’s undercover mission, a failed police sting operation, So-jeong’s dangerous deal with drug dealer Go Kwang-cheol, the treatment of wounded criminal Gim Si-hyeon, and a dramatic hospital escape where So-jeong stages a hostage situation to help the criminal flee.
