Memoir of a Murderer

"Memoir of a Murderer" is a dark and unforgettable Korean psychological thriller that masterfully blends suspense, memory loss, and serial crime. Based on the bestselling novel by Kim Young-ha, the film follows Byung Soo (played by veteran actor Sol Kyung Gu), a former serial killer suffering from Alzheimer’s disease, whose past crimes begin to fade from memory—just as a new danger emerges. Living quietly with his daughter Eun Hee (portrayed by Seolhyun of AOA), Byung Soo tries to live a peaceful life, jotting down his remaining memories in a diary. But when he suspects that her new boyfriend, Min Tae Joo (played by the charismatic Kim Nam Gil), might be a serial killer, his instincts resurface. Trapped between fading memory and present terror, he becomes a killer trying to stop a killer—before he forgets who he is and what he must do. As the line between reality and delusion blurs, Byung Soo’s deteriorating mind becomes both a weapon and a weakness. Each moment is a ticking clock, each decision clouded by doubt. The suspense intensifies as he must fight not only an external threat but also the terrifying betrayal of his own brain. With the help of flashbacks, unreliable narration, and brilliant cinematography, the film keeps viewers questioning what’s real until the very end. "Memoir of a Murderer" stands out among Korean crime thrillers for its deep psychological layers, morally complex protagonist, and stunning performances. Sol Kyung Gu’s haunting portrayal of a fading mind is both chilling and tragic, while Kim Nam Gil adds intensity and danger as the smooth yet sinister antagonist. If you're looking for a smart, twisted, and emotionally gripping story, this is a must-watch in Korean cinema.