Park Chan-wook channels jet-black satire into a tale of a laid-off everyman (Lee Byung-hun) who decides that eliminating the competition is a rational career move. The horror lies not only in the acts but in how easily bureaucracy and ambition accommodate them. It's a chilling, funny, and morally exacting riff on Donald Westlake's "The Axe," performed with unnerving calm; Korean with English subtitles.