The very end
Heartbreaking yet enthralling film. My only complaint, and this is more a general gripe about Korean films, is that it's a bit too long. I'm not sure I've seen a Korean film under 2 hours.
Anyway right at the end, when you've been moved by the events but maybe forgotten this is based on a true story, come two scenes that drag you back to reality. Manipulative maybe, but it worked for me.