Why Don't I Have Anyone By My Side?

Story:

Nayul's constant thought is, "I don't think anyone will want to be friends with me…" Seoyoon, a boy from her past, unexpectedly re-enters her life when he enrolls in her class one day. When they were younger, Nayul and Seoyoon were best friends. However, for unknown reasons and following a number of misunderstandings, he started to avoid her and continued to treat her coldly upon their reunion. Will Nayul's dim world ever get any better?