About a man seeking violent revenge against a serial killer for slaying his pregnant girlfriend, the movie tells how, 'to win over evil, the main character has to become evil hismelf,' he said.
'This is the first script I didn't write myself,' said the 46-year-old, an established filmmaker in South Korea, on the eve of the film's opening in the United States this weekend.
'There was not any specific news that drew me to this story, but there was a time where there were major serial killers in Korea,' he told AFP in Los Angeles.
Kim is known for trying his hand at a range of film types, from horror flicks like A Tale of Two Sisters (2003) to action movies like 2005's A Bittersweet Life and The Good, the Bad and the Weird (2008).
This time he gets his teeth into a thriller, in the form of a secret agent bent on revenging his lover's death by causing her killer as much pain as possible before killing him.