6. THE CHASER (2008)

Loosely based on crimes committed by real-life serial killer Yoo Young-chul, The Chaser is a cat-and-mouse game between a slayer and a cop-turned-pimp who's avenging the deaths of his top escort girls. It’s a well-constructed thriller, but when it comes to killing? The procedures consist of decapitation and nonchalant hammering of female limbs. Feminist groups must love this one.