I went into watching this movie expecting to cry a lot... and boy did I cry. It was 2am last night and I woke up my mum (bad decision she was pretty mad I was still awake lol) but I don't regret it at all. This movie was incredible, and once it's finished you'll be so thankful you that you've watched it. At first I thought it was going to be this depressing film that just made me sad ALL THE TIME, but I was wrong, and I'm so thankful that I was. This film made me smile, laugh out loud and cry, that's when you know it's a good movie. Don't not watch this because you think it will be too sad for you, because it's just the right amount of sadness along with a lot of happiness.
I'm a huge fan of So Ji-Sub so that was one of the main reasons I decided to watch this, but I also really loved Son Ye-jin's performance in Something In The Rain, and neither of them disappointed me. They executed their roles perfectly, along with the little boy I was extremely impressed with all of the acting in this movie. The story line was well written, and I definitely didn't expect the plot twist and the end (I guess you will have to go watch the movie to know what the plot twist is). The whole plot was unpredictable but that's what made it so amazing.
In regards to music I don't really remember the sound track, but I really loved the song Some by Bolbbalgan4.

Overall I would highly recommend this movie, I'm going to rewatch it tonight and I don't think anybody should be deprived of the pleasure to watch this, because it was just that amazing.