The main characters could be an older man who has a stable life in the country and a younger immigrant woman. The man may have lost his previous love and is a bit jaded. The woman is eager for a new start. Initially, their marriage is just a means to an end for her. But the man's wisdom and stability start to attract her, and his appreciation for her youth and energy makes him fall in love too. And thus, they develop a relationship beyond the green card deal.