When people reach middle age and marriage reaches middle age, love seems to have been forgotten. An ordinary mistress disrupts the protagonist's peaceful life, and she suddenly realizes that she also needs a love. Looking back in pain, it turns out that middle-aged marriages are faced with crises of one kind or another. Different families have different problems. Does it mean that people lose the desire and right to love when they reach middle age? Can she still gain her own feelings? Should we resolutely abandon the old nest or regret it for the rest of our lives like a covered bridge in a wet dream? Where should middle-aged marriages go?