Serious men are the most handsome. Since he is in the library, it shows that the other person is the kind of girl who loves learning and pays attention to rationality, so why do you care so much about where to sit? If you sit behind because you are shy, congratulations, you are hopeless in your life, because 80% of the other person's attention is focused on books. Personally, I suggest sitting in the front, so that you can occasionally give her a smile or give her a thoughtful impression that you like or are interested in you.