I started this drama twice. The first time I didnt understand why we were spending time with a middle shcool character, and the second time- I could not stop watching. As someone who has never experienced a first love, or even a crush, the writing and acting done in the show managed to portray all the feelings that come along with it in a way that even i ended up feeling them. It felt as if i was expriencing it along with the FL, the innocence and heartaches of a first love. The time the show spent on that part of the story ended up being my favorite part.
But besides that- i believe most of the cast, especially the leads did a really good job; their facial expressions and body language were on point. Specifically in cdramas i think its the most important part of the acting since the actors get dubbed over.
One thing that did bother me though is that sometimes plot points were dealt with too fast- i wont spoil it, but lets just say that there were never any real consequences to anything, and even if there were they were solved very very fast.
I think that was a real waste, since it could've been used to develop the characters and let the audience have a better understanding of them.

In conclusion- if you're looking for a sweet, healing and worth while drama, this is the one for you!