Casting - definitely the best choice. Kim Soo Hyun did a superb acting, those emotions coming through his eyes. I loved Son Ye Jin's voice and wardrobe! Oh Jung Se did so well portraying as an autistic adult.

Storyline - something new, addictive for me, the twists and turns are unexpected! I did cry on some episodes that are really heartbreaking.

Music - loved the OST! I saved it on my spotify playlists.

If you haven't seen this drama, I highly recommend it! Worth watching.