Movies You Should See: Oldboy (2003)

After being imprisoned for 15 years, Oh Dae-Su is finally released and finds himself still trapped in a web of conspiracy and strangeness. His own quest for vengeance becomes tied in with romance when he falls for an attractive sushi chef.

This film has just enough twists and still one of my favorite Korean films. I won't spoil the ending but will provide the IMDB link if you're just dying to find out. Trust me if you like an intriguing story with a SICK twist, this is the film for you!