First of all, I am not a native Chinese neither am proficient in Mandarin, I watched it raw and I enjoyed it. After 100+ Chinese dramas watched, I can pick up words here and there and the simple story line is easy to follow. For main issues to understand I just google translated it. Anyways, It's a short high school drama (the campus life and campus romance tags are wrong cos the setting is high school). I don't watch high school dramas, but the OTP is so cuuute ❤️ together and they look alike like they are made for each other, lol. Besides, it's only 24 episodes of 12 minutes each, it's a breeze.
So the story is just a high school cliche of a handsome transfer student who doesn't really care about being in school, somewhat lazy but genius. Of course he has to sit next to a cute girl who is typical studious but dumb in math to the point being ridiculed by the teacher in front of her classmates. So the guy helps her and they become fast friends along with others, navigating thru the high school. The story is told as a flashback by the Female Lead. The acting is good, I love the sweet chemistry between the new comers Chen Xiang You (陈翔宇) and Chen Si Yu (陈思宇), and I want to see their acting again in the future. Although, if you are a fan of drama kisses you won't see any here cos China censorship doesn't permit any type of kissing in their high school dramas. The OST is good "Don't Say Sorry" duet by Liu Binhao & Song Xi, see the OST link in my custom list of 2020 Completed Dramas if you want to know. I do not want to re-watch it cos simply it's a high school drama which genre I usually despise.
If you want to watch it raw, see the conversation between me and the first reviewer (I'm the second) to get the link.
So to answer my own question in the title: Easy to guess that people rated low but did not even watch it because there is no (English) sub. Hopefully, in the future some fan will pick it up, cos it's a sweet short teenage romance.