First off, let me say that the reason why I'm not giving this live action a solid 10 or even a 9 is because I will not over hype it and I will not simply do so because Yang Yang is in it. And also, my review will be all over the place.
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The producers did an okay job of keeping the story line true to the novel BUT their biggest blunder was messing up Chen Guo's character. She would have been better off staying as how she was portrayed in the novel and not this weak willed (?) woman in the live action. I don't mind the other changes they made to the live action though.

Anyways, the way they portrayed Chen Guo with always wanting help on her test books (?) or whatever makes her seem so stupid. It made me wonder "how in the world does she manage to keep her shop open.." and why did she even need to study the books?
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I've also noticed that some comments seem to have an issue with how "old" Chen Guo's character looks but I think she looks acceptable enough. If you have ever read the novel, you will know Chen Guo is supposed to be the oldest of the bunch, at 27, until Wei Chen joins them.
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The friendship was very touching and I liked seeing it come to life.
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The story was good.
Acting was ok but sometimes a little cringy.
Music is 10/10.
My rewatch value is low because rarely do I ever rewatch anything.