tvN Movies, Astro Ch 435/HyppTV Ch 222, 10pm According to Google, psychopaths make up about 1% of the general population. The Mayo Clinic describes psychopathy as a personality disorder where one has no regard for right and wrong. How does this information benefit you? Well, think of it as food for thought as you watch this 2003 South Korean thriller. Directed by Kim Yoo-jin, two detectives investigate a string of horrific murders in Seoul at the hand of a psychopath who carries a metal ball and chain. Why a metal ball and chain? I don’t know man – he crazy.