So a lot of people have compared this director's work to his previous work My Sassy Girl which came out about 2 years before this one did. There have been many comparisons between this one and that and while there are similar themes in choice of music and themes I would say it is like comparing apples to oranges. MSG was funny and then got dramatic hence it is a romance/comedy with some drama (if anything, i would call Windstruck MSG 2). This one was mostly a dramatic romance story with a few very classical clichés. There is enough foreshadowing that you can guess what is going to happen if you pay any attention at all and have seen any Korean drama, but the director still does an excellent job in telling the story.
The main characters do an excellent job acting and bringing out the character's emotions. The story is beautiful and so is the music. Enjoy it for what it is, if you have a heart at all you'll be teary eyed. You'll know what is coming and you'll still be floored by it, thats how good it is. Even the ending, which I thought was a bit over the top, is the only way you could have ended a classic.
I am a little hesitant to say that this is a date movie, definitely not for a first date. I would think that any emotionally sensitive human being is not going to be particularly happy throughout most of this movie until the very end. Such is a melodrama.