The first arc is cringe, with the FL acting like a wide-eyed cat girl and the ML coming off as creepily forward. You don't find out until the end how he knew her before she realized, which if they showed us that earlier would have made it much less ick. As others said, it's like a weird fanfiction where the ML is literally perfect at everything and yet he's magically in love with you??
Oh and the second couple is ick, their age gap is wider and more obvious, exacerbated by the 2nd FL's weird short straight hairstyle/wig making her look even younger.

Once you get to the second arc, the Yangshuo 10th anniversary performance arc, it's much better. The story and music is more interesting, there's more focus on other things than the main couple making googly eyes at each other. After this, they're much more relaxed and comfortable with each other. Zhou Ye's character is less of a weird snack troll and finally acts more like just a normal shy girl. By the end of the drama I felt overall this was a nice watch, it's just the awkward first arc that brought the rating down.