Swapping: My Wife's Friend: Jeon and Seok-jin, who are married, rarely have children even though several years have passed since the marriage. One day, his planned friend Joo-hee divorces and stays at his planned house. After contemplating, Seonjeong asks Joo-hee for a surrogate mother, but Seok-jin opposes. After hearing the situation of a friend who wants to have a child, Joo-hee finally, You seduce Seokjin to have a relationship.