The book

Charlotte is socially awkward she blocks off herself to the world, hiding behind her big glasses and her nerdy look, believing that if she does this, no one will recognize her. She is usually a cheerful person. But people kept bullying her because of heterochromia. Luckily she was smart to kind of change her look in high school.
Certain circumstances lead her to her meeting this mysterious and indifferent boy, who turned her life upside down.