This very arty Korean movie follows an ordinary guy named Oh Dae-Su as he's snatched off the street one rainy night and imprisoned for fifteen years. Just as he thinks he's about to escape, he's released and he embarks upon what he hopes will be a mission of vengance.
But it doesn't work out well for him, because it turns out the real world is simply a bigger prison. (Wow, that's deep.) Gradually, the identity of his tormentor is revealed, as well as the motive; the true nature of the torment isn't revealed until the end.
Lots of disturbing scenes here. Violence, including the graphic eating of a live squid. (I get the creeps just remembering that.) Definitely not for the squeamish.