I mean what can I say that hasn't already been said?
It's a fantastic drama that made me care. It made me care so much that it's hard to believe these characters are fictional.
The themes in the story are just perfectly complex and very human, the acting is phenomenal, mainly for our two MLs. Seriously, Xiao Zhan really shines in this role. And their chemistry is beautiful. The drama versions of them are probably one of my all time favorite couples in fiction (and yes, it is canon).
All I can say is you will seriously be missing out on something truly beautiful if you don't watch it.