First, let me explain that I don't speak or comprehend Korean. I also watched the only available version of this film, which just happens to be with Korean audio and no subtitles. Also, my knowledge of Korean history is pretty sparse, but serves me well enough.
With the caveats aside, I enjoyed this film as well as one can without understanding any of the dialog. I agree with the other reviewers who say this film is a good mix of action, drama, and comedy. Obviously, the action translates just fine. I understood a great deal of the comedy and was surprised to be able to get most of the dramatic happenings. That said, most of the drama was lost on me, I was only able to understand the basic gist of it.
This did not stop me from enjoying the film. I was surprised at how similar this film was to a Hollywood offering. The 'wife' does action well and the closing scene was a good laugh. Maybe if I understood the dialog I would have seen it coming, but it was a funny surprise to me. The hip-hop closing credit song surprised me. Funny how flexible western culture can be. I can understand how people of other nationalities can feel they are being 'invaded' and sense a loss of their own culture. Perhaps if I watch it again, the combination of reading other's reviews and having seen it once, I would get a lot more from it.
I am just starting to get into writing reviews and look forward to doing many more.