In the high-stakes world of emergency medicine, a dedicated resident's life fractures under pressure in this gripping psychological thriller. Harry Shum Jr. stars as Dr. Ian Harris, a promising surgical resident whose meticulous control over his life and work is shattered one fateful night. When a series of catastrophic events unfolds within his hospital, Ian is forced to confront a terrifying duality within himself, pitting his oath to do no harm against a ruthless, survival-driven alter ego. As the night descends into chaos, he must navigate a labyrinth of ethical dilemmas and mounting peril, with colleagues like the sharp and observant nurse played by Rosaline Elbay becoming unwitting participants in his desperate struggle. Directed by Chris Hartwell and written by Julia Cox, the film masterfully tightens the screws, transforming the sterile, fluorescent halls of the hospital into a claustrophobic arena for a brutal internal war. "Do No Harm" delivers a tense, pulse-pounding exploration of a man racing against the clock and his own psyche, where every decision carries lethal consequences and the greatest threat may be the person he is desperately trying to suppress.