What I loved:
1. The characters - especially between the brothers. Brotherly love and loyalty isn't always sweet and respectful. Brothers fight all the time because of how competitive some of them are. There is always a favourite, and there's always a mediator in the mix. I just loved the acting and the dynamic between the actors who played the brothers because it came across as feeling very genuine.
2. The clever plot and how all the problems were resolved. So brilliant! When I thought the movie was about revenge, another plot line was revealed. When I thought it was a story about a prison break, a mystery plot was revealed to hook me into following that plot line. All the twists and turns really paid off at the end. This movie isn't all about the violence and the hate. It's also about social injustice, and it presents an angle that I have not seen before in other HK triad-type movies.
3. The artistry. I loved the cinematography, the set designs, the costumes, even the Cantonese subtitles. I don't know how many viewers noticed this, but that was simply brilliant!