Sisters Su Qing and Su Wan enter into commercial marriages with the Fu brothers, Fu Chenzhou and Fu Yang respectively. On their wedding night, due to heavy rain obscuring the house numbers, the two couples swap their engagements, kicking off a comical and hilarious married life. Su Wan gradually grows to rely on and fall for Fu Chenzhou despite initially disliking his strict discipline; Su Qing and Fu Yang also break down each other's stereotypes, developing mutual affection as they get along, and ultimately the misplaced marriage between the four of them bears sweet fruit.