One of the primary themes of the movie is the concept of love and relationships. The film explores the idea that love can be unpredictable, messy, and often unrequited. Summer's character represents a free-spirited and independent woman who challenges traditional relationship norms. Tom, on the other hand, represents a romantic idealist who learns to let go of his expectations.

The movie follows Tom Hansen (Joseph Gordon-Levitt), a struggling architect who meets Summer Finn (Zooey Deschanel), a quirky and charming woman who doesn't believe in love. Despite their differences, they develop a deep connection, and Tom falls in love with Summer. However, Summer warns Tom that she's not looking for a serious relationship, and she eventually breaks up with him.

"500 Days of Summer" is a 2009 American romantic comedy-drama film directed by Marc Webb. The movie stars Joseph Gordon-Levitt and Zooey Deschanel as two young lovers who navigate the complexities of relationships and expectations. The film received critical acclaim for its non-linear storytelling, witty dialogue, and memorable performances.