Bong Joon-ho—who gave us the incredible, genre-scrambling giant-monster movie The Host—returns with this 100 percent gripping thriller. Kim Hye-ja plays a doting mother whose mentally challenged son is charged in a horrific murder. Convinced that her son was framed, mom will stop at nothing (and I mean nothing) to find the real killer. Like so many South Korean filmmakers, Bong juggles shocking violence, surprising black humor and utter visual beauty with the skill of a master. The tone is slippery, but the film is pure post-Hitchcock genius. In Korean with English subtitles. See also:Notable South Korean titles from the Netflix Watch Instantly world by Devin D. O’Leary (08/24/2010). 128 minutes R.