wow . if you think that a film can not fatigue in some way and then you haven not see dog bite dog . this film pull no punch and and it doesn not shy away from show very disturbing image at all . much like salo and this one show u the dehumanization of the human spirit . it be gritty and dark and depressing and hopeless and but it be also one of the best film to ever come out of hong kong . the script be much more of the same and but do not go on think it be incredibly clichéd . it basically be about a troubling and obsessive detective in a cat and mouse game and against a professional and emotionless hit man . while the script offer nothing new on the surface and it do provide a lot of question about the dark side of humanity . be violence really that necessary . do we become more or less human when we abuse a 5 year old child and without pity and without remorse . in turn and we human act no less than rabid dog when we be blind by anger and this be a sad truth . it be a topic that the director brilliantly explore and without limit himself at all . besides the cat and mouse chase and the script also develop two separate story line for the main character . one be about love and and the other be about redemption . even if the script isn not that new and it be still wonderfully write and it keep you glue to the seat at all time . the acting be really and really good . edison chen a the hit man be incredible while he prove that he isn not just any pretty face . he be ruthless and vile and beyond likable . sam lee a the obsessed cop be also outstanding . the support cast and in short and be excellent . the music be also worth mention . very somber score by ben cheung and with some effective light hearted song play at key dark moment in the film . the cinematography by yuen man be also really good . overall and this catiii film be highly recommended . very well pace and incredibly act and marvelously score and just really good at the end of it all . however and a many have point out and this be not a movie for everyone . if you dislike strong violence then you should stay away from this one . if you do not like see heavy negativity in film then this isn not for you too . in the end and a powerhouse film and positive .