Mary Kills People (2025) Episode 3 is now available in Full HD with English Subtitles. This gripping South Korean medical thriller and black comedy—broadcast on MBC and directed by Park Joon-woo—continues to explore the ethical gray zones of assisted dying.br br Episode 3 delivers a shocking twist: Cha Hyun-woo is unmasked as undercover detective Ban Ji-hoon, previously posed as a terminal patient to draw Woo So-jeong into a trap. Hidden cameras in his staged apartment expose his deception, instigating a deadly cat-and-mouse gamebr br Meanwhile, So-jeong faces personal crisis when Woo-mi's mother discovers her daughter took a euthanasia drug from So-jeong’s home and confronts her directly. In another emotional storyline, Dr. Choi Dae-hyun helps terminally ill Su-young fulfill a final wish—to confess to his crush—even as the young patient’s condition worsens.br br Forewarned by a call that the real Hyun-woo has died, So-jeong escapes the sting setup, destroying the last vial of euthanasia drug on the road. Taking swift action, she secures a new supply from Gu Gwang-cheol and races to administer it to Su-young, helping him pass away with dignity.br br This episode merges psychological suspense with emotional weight, reminding us that right and wrong often inhabit the same space.br br Watch *Mary Kills People (2025) Episode 3* in Full HD with English Subtitles—and stay tuned to DramaRelic for more Korean thriller hits.