Kamurai
Great watch, could watch again, and can recommend.
This is a great survival horror story that really rachets up the tension as the situation progresses.
The idea of being hunted in the subway with homeless and rats around is very intriguing for me. Sadly, like most good horror movies, I can't talk about most of it without spoilers.
I will say this has some great concepts in it and the over all story structure is very well done with some good twists / surprises in it.
It may not be a feel-good love story, but it would be a pretty bad survival horror story if it was.