When asked where the idea for the movie came from, Julio Medem said that he started thinking about it after getting divorced, because it was the first time he experienced heartbreak and wanted to write a movie about the love as the most powerful force, something that never ends and it's forever between two people.
There's a character named Aki in the movie. This is a direct homage from director Julio Medem to Aki Kaurismaki, which Medem deeply admires.