My thoughts on this movie:
It felt rushed where if they had only added text like "a few days later" or "6 months later" would have cleared things up.
What was real? What is a dream? by the end I was not sure, but I think my brain is untangling it.
I did not/Do not read this Manga and according to the reviews the Manga clears up a lot of the confusion BUT I am just looking at the movie as it stands.
I like the fact that "the incident" (As I am the first post I am trying to keep it spoiler free for those that keep scrolling even though they are told not to) isn't one sided. That you see his feelings about failing to save her, as well as what she went through. That is rare in dramas from any country.
Now Discuss Away ..feel free to post spoilers as people have been warned..thrice now