3-Iron
Very impressive movie that makes me invested in the relationship between the two main characters despite them never uttering a single word. There's something weirdly intimate about them falling for each other through action and presence alone. I usually hate cheating in movies but I sure don't mind it in this one!
I like how he haunts all of the places he crashes at. On top of doing the chores, he leaves a fairly innocuous thing behind. It's usually a small thing, like turning back the clock or adjusting the weight scale, but it's enough to be noticed without suspicion of tampering. He leaves a small imprint of himself behind as if he were a ghost. This idea leads to probably the funniest ending I've ever seen in a movie.
It had the usual corrupt police trappings that you see in lots of other South Korean media, so I felt the middle of the movie was weaker than the rest.