I don't really see much discussion over John Woo's heroic bloodshed films on the boards but I wanted to recommend a really good film.
A Better Tomorrow, a Korean remake of the Chinese 1986 John Woo film starring Chow Yun Fat. The film stays pretty true to the original only having minor differences. The film's backdrop was updated to North and South Korea to make it a more modern. Without giving too much away, the movie follows two brothers that are North Korean defectors that are on opposite sides of the law. One brother being able to flee North Korea while the other brother was captured and imprisoned. The brother who was successful in fleeing, became a high ranking mobster with Korean mob's black market weapons trading with the Thai mob. When the imprisoned brother is set free, its not exactly a celebration between the two as the imprisoned brother joins the police force. Honor and vengeance thrown in the mix make this an awesome update on Woo's heroic bloodshed genre.