City Hunter was really action packed but really lacked romance. and the ending I felt was too fast and lacked a good resolution.
The beginning started out rather tragically and honestly, the ending doesn't have the happily ever after "feel" even though it's not technically a "bad" ending either.
Honestly, there are other dramas that did similar plots with North Korea and South Korea having power struggles, such as Doctor Stranger, that I liked much better. Although, maybe I'm just more intrigued by medical dramas.
Overall, City Hunter was a very good, action packed, drama with a great OST, but I don't think I'd find myself rewatching it or even dwelling too much on the story in my head.