Two reviews, two comparisons.
The movie made me think of Luc Besson's "Leon", one of my favourite films ever. The feel is the same, and so is the awkward yet deeply touching relationship between Tae-shik and So-mee.

Won Bin's performance is superb, his misery and loneliness enphasized by the constant darkness of the setting and the few sharp lines he is asked to deliver. But just as brilliant is the kid's acting and that of the two schizoid criminals with their dark humour, one lamenting the blood on his Dolce & Gabbana's shirt, the other toying with eyeballs.

Stay away from it if you are easily disturbed by blood. This movie is violent and pretty graphic, and the ethic underneath the blood shoking and insufferable. The Korean police are doing what they always are in Korean films: nothing. Except being activated to a frenzy by the only hero of the story.
At times, one wishes one could enter the screen ad shake some sense into the police force. I can only hope this is a dramatic device, more than a window on reality.

The action scenes are brilliantly enacted, with enough close cut shots to make them believable and felt.
Overall a superb movie, not to be watched while eating, though.