I absolutely loved this drama. There's no mistaking that there are some plot holes here and there and that a lot of people wish they had gotten to see more of the "ending", but I think everything else outweighs that and makes this a 10/10 for me. The characters, the acting, the story were all amazing, emphasis on the character/acting because WOWWWW it's been a while since I was so attached to so many characters while watching a k-drama. Dramas can often become boring to me even after initially enjoying them but this show had me hooked.
Some say giving this a 10 is overrating it but I think this drama has a really beautiful story that so many people can enjoy, its so very touching.