Please emember that this is just my opinion, and you don't have to change anything if you don't want to.
Now, it's important to say that it was not that the book is bad, it's just not my cup of tea. Because of the usage of a very classic trope (especially in K-dramas) I don't find your book very original. The parts where you described shyness and being an introvert is not a bad thing and nothing to be ashamed of was good, but the way you describe it made the parts hard to read. While writing, always remember not to write what you mean directly. For example the part where the mom got angry at her daughter for being shy and introvert was not realistic and kinda made me want to jump to the end of the chapter. İnstead of saying these type of things directly, you can choose other ways. For example, her mother could say things like "You are not good at studies and don't even have an excuse! It's not like you go out and hang out with friends! You don't even have more than one friend!" (I know it's a rude thing to say but the mother kinda gave me the vibe who would say things like this)
Overall, it's not a bad story and I can see that many people like it, but as I said, there are a few things you can use to improve!
