10 Great Horror Movies You'll Only Watch Once
2. I Saw The Devil (2010)
The plot is simple and horribly twisted: One day, a serial killer murders the daughter of an intelligence officer, who in his insurmountable grief devises a plan to torture the killer for as long as possible, as punishment for his sins.
Though some may question labelling I Saw The Devil a "horror," but the agony and emotional turmoil of the film's central drama is so dense, so overwhelming, so heartless and without hope to the very last frame, that there's really nothing else it could be called.
Directed by Kim Jee-won (of A Tale Of Two Sisters fame) and written by Park Hoon-jung, this South Korean thriller would make a perfect double bill with Oldboy, both being pulverising tales of the futility of revenge and lost humanity that offer no solace in their final moments. Or any moment leading up to it, for that matter.
Sadistic, bleak, frighteningly violent and heartbreaking, I Saw The Devil is a relentless thrill-ride into the darkest depths of humanity, and is such a soulless tragedy that watching it again is not an option.