Overall I enjoyed this show a lot, especially because of the main characters. They were very cute together, the development of their relationship was after all really healthy and lovely to watch.
I actually understand the disappointment with the ending, which certainly could have had potential for a better development despite it not being a happy ending. The writing certainly has flaws, and has nothing original, but I think there is something very essential about this type of works. There are many perfect dramas, with a perfect ending. But life is not like this, and as the author wanted to say, make our days count, because death comes like this, without meaning, without prior warning. So even if the ending seems unnecessary or nonsense, well it only reflects what life can be. Life IS nonsense, and it's taken away from us even more easily than it takes to give it to us. Hao Ting's emotional closure, his mother encouraging him to move forward, his liberating cry, everything is a good portrait of what is real. Showing that he hasn't moved on yet, attached to the memory of his loved one, is just the most human thing they could write. His words in the last part of the episode were the perfect way to describe what it feels like when someone you love dies, your life goes on and he's still there, stuck at his age, always the same, forever, and it's really scary to move forward.