The love interest of Tom Hansen in (500) Days of Summer. She does not believe in true love and isn't interested in a serious relationship.
Summer Finn, played by Zooey Deschanel, is the love interest of Tom Hansen in (500) Days of Summer. She has a differing opinion on love to Tom - she does not buy into the notion of true love and makes it clear early on that she doesn't want to be in a committed relationship.
She starts work as the new secretary at a greetings card company where Tom works on Day 1 of (500) Days of Summer. The pair meet and bond, and soon start dating. They eventually break up, and while Tom has a particularly hard time getting over her, Summer falls in love and marries someone else, feeling true love and willing to commit.