Kim Woo-Bin's acting is phenomenal. Any praise for Woo-Bin falls short. Every expression in every scene of his is exactly on the mark. No compliments can do this man justice. He is incredible!
The soundtrack is incredibly emotional and well-thought out too. Even the silences are well-placed and deliver emotionally. Pieced together, this is a masterpiece.
Regarding the storyline, at a few points, it feels as if very obvious things were ignored by the characters, just to further the emotional impact, leading further away from believability & reality, but it is a K-drama after all, and this can't be a reason to criticize this show.
Unfortunately, I think this series didn't highlight Suzy's strong points. If you didn't have context, you wouldn't know if she was smiling or crying. Nevertheless, I really can't justify removing a single star from this review.
Despite a few forward-able scenes, this is the show that has stuck with me the longest. This show makes you re-evaluate life. From start to end, it makes you feel so many emotions that you can't put a word to. Woo-Bin was the highlight, but everyone did a fabulous job. Incredibly well scripted and directed.