Most of what I have to say about this drama has already been said, so I'll just summarize my own thoughts in a few points:
-The main couple were AWESOME! They had so much chemistry despite their age gap.
-It's definitely a slice-of-life drama. It was more realistic than other dramas in showing how messy real life and love really are.
-He Fanxing was consistent, though I got very annoyed at her naivety after a while.
-The mom started out bad, but turned good. Mad respect for her character development.
-The characters were loveable and believable. The drama managed to develop their stories without taking the focus away from our beautiful leads.
-Even though he was really annoying, I LOVED Ye Lu Ming! I really respected how he let He Fanxing go in the end, instead of trying to force her to love him or selfishly holding onto her. That was a very mature thing for him to do.

A few things I didn't like:
-The breakup dragged on FOREVER. They put us through ALL that, and they only get back together in the LAST EPISODE???? SERIOUSLY??? Typical rushed ending to a Chinese drama. When I find a Chinese drama that doesn't drag the last 5-10 episodes then rush the ending, I will probably have found the perfect drama. I would've preferred if they'd used the last three episodes to tie everything up instead of doing it in the last episode. I also felt like He Fanxing should've recognized her love for Yuan Song wayyy sooner. I started wondering if she was just stupid after a while.
-It's not that I didn't like Professor He and his girlfriend, but they came off as friends more than lovers, at least to me. It also felt a little contrived, since the whole point of the drama is the age gap between his sister and her boyfriend.

All in all, it's a worthwhile watch if you can get through the draggy bits. But doesn't that describe every Chinese drama that ever existed? I think I'll enjoy it more during a rewatch because I can skip the annoying parts haha