Best bit is the twist ending, no doubt, but the fight with the kids is so realistic it's unreal.....

The fight against all the thugs in the building in which he was imprisoned, after the dentistry.

The fight with the thugs in the hall is just magnificent, perfect and sureal in every way. again truely amazing camera work as well.

Hard to pick just one. The corridor fight with the thugs was freakin awesome. The fact that it was all shot in a single take was the cherry. I also loved when he got knocked over by the teens and just takes a puff of his cigarette before beating the crap out of them. And I really loved the last confrontation in Woo-jin's penthouse. Every single thing has been building up to that moment, and the tension of whats about to happen is intense.

Yes to all the above posts. But the real best scene is when Dae Su talks to the brother (in his gorgeous apartment)and reminsces about the school days and what had happened. The brother becomes moody thinking about it and says...'ah this is no fun.......' See the pain in his face when he says that. Classic as only he knew that pain and we did not even come close to working out what had happened. Then comes the greatest reveal in the history of film making. No one has bettered that reveal and no one will. All the best ingredients of film making came together in this great film. and the music is just so beautiful. brings tears to your eyes. In the end the saddest film i have seen. the violence gives way to this extreme sadness. Ohhhh...just unbelievable.