This movie is simply excellent. The story may be the typical Korean melodrama, but it's still a touching one nonetheless. A must watch for fans of Korean movies.
For fans of My Sassy Girl, Windstruck is also a must watch as Jun Ji Hyun is great in it. While some may say that this movie does not live up to its hype as the sequel to My Sassy Girl, I am inclined to disagree. The plot is in its own right beautiful, and there is no reason why not to catch this movie just because it is a supposed "clone" of My Sassy Girl. There are numerous easter eggs and references to My Sassy Girl here, and while I concede that some do not serve any real purpose in furthering the plot, most of them are pretty interesting, and would be instantly noticed by fans of My Sassy Girl.
It is rather long though, and at times can appear to be rather drawn out. However, it still rates as one of the best Korean movies I've ever watched.