My Wife Got Married (2008)

It all started with football. Deok-hoon falls in love with In-ah, who shares his love and passion for the sport. They quickly become lovers and he proposes. After her initial refusal, they are eventually happily married. Marriage is like a dream until one day In-ah declares her wish to marry another man. She doesn't want a divorce, as she truly loves Deok-hoon but she wants to be free to love another man at the same time. Even with Deok-hoon unable to handle being the third side of a triangle, In-ah marries her new man and sets up a bizarre, polyamorous romance.