Everything in this drama is just wonderful. I love the character development, especially Yong-sik (played by Kang Ha-neul), he showed that men can also express their feeling openly and shower someone they love with lots of affection. He reminds us that if we love someone, don't take too much time to think and don't be afraid to show them our feeling regardless of their response. At the end it's all about how amazing us, as a human being, are able to feel love, to do everything for that one person, and to be the happiest person on earth.
So, if you're reading this, I suggest you go straight to Netflix and watch this movie. I never wrote a review about k-drama before btw, so yeah, this drama is really something to me.
Enjoy!