I love both Zhao Lusi and Chen Zheyuan... also i am an absolute fan of fluffy love story but to be honest they would both have better chemistry if it was for a different drama. Saying that this show is overrated does not mean it sucks it just doesn't justify for the high ratings in my opinion (FYI my review is also just based on the drama not the novel).

Throughout the show I have a few ???? moments.

(1) I didn't liked how the FL is portrayed in the show.
The show started with FL when she was about 14 years old and she fell in love with ML who was 19 years. BUT the child actress does not look like 14 but 8-10. it looks strange and cringy. Why couldn't they cast a young girl that look more like her 14/15 (or atleast give ML a younger boy actor too).
Also, when FL grows up, she still speaks like a kid in a kiddy tone, the way she behaves is as though she is like 12?

(2) The romance
Throughout the show, their 5 years age gap is heavily emphasized all the time.. is it really such a big deal. I have watched so many drama with big age gaps but i didn't know 5 years is a lot to be a problem. They portray the male lead to be OLD like he is just 24?
I also didn't liked the development from bro/sis to lovers. ML's pov of how he fell in love was pretty sudden to me. In the show, there weren't any progress in how he fell in love but more like a one time and boom "i gonna woo you" the next day. Even ML confession didn't felt wow.

I guess u can dissect this drama into
1st part: FL's pov, her falling in love
2nd part: FL grew up (aka. went university) and met ML again
3rd part: ML fell in love and happy ending

Despite all these, the romance is quite sweet to watch after they got together.. but it's really not my cup of tea. I wouldn't rewatch this.