Modern girl Yu Wan transmigrates into an urban novel, binding with the "Happy Housekeeper System". Within three years, she helps six employers raise their true happiness value to one hundred percent and bags six five-star reviews to receive generous rewards. The six employers each have their own inner knots: the overprotective and controlling manager, the cleanliness-focused and gentle type, the female boss trapped in old feelings, the female singer with a sense of distance in interpersonal relationships, the emotionally dull popular man, and the hidden-married couple polite like partners. Yu Wan resolves them one by one with sincerity and worldly warmth, letting them regain happiness.