Really terrific movie. Filled with dark humor and even darker life lessons, it melds the unquestionable illegality of the criminal with the questionable legality of the cop. Beautifully acted by Kim Rae-won who has the ability to 'become' the character in whatever role he assumes with an ease and smoothness unmatched by most actors out there, imo. He is why I watched the movie, but the plot was more than just entertaining and is what kept me watching. It moves quite rapidly and I found the story of Dong-hyuk to be engrossing not because of the violence and action that usually draws me to these types of movies, but because, as is so typical with especially Korean film, the story had its deeper lessons to teach. In the small parameter of what could be expected from a deeply flawed character such as Dong-hyuk we get to see growth and development from a deeply flawed and lost hoodlum, to a still flawed but purposeful cop. No perfect fairytale ending, but it is its own 'success' story despite that. Don't remember the music (I watched this a year ago). I definitely want to watch it again one day, given TIME! This is the kind of movie that tells you more about the characters and the story as you pay more attention. And, I love KRW.