No one in Shengjing's circle of powerful nobles could have imagined that the childcare expert who can instantly soothe every family's hard-to-console little ones is actually the impoverished young woman Song Yubai, who haggles over even two copper coins. She understands baby talk and launches a childcare business, mastering every infant's discomforts, likes, and dislikes, from feeling hot or cold to aches and itches. She specializes in solving all kinds of 'difficult cases' involving pampered children of aristocratic families, taking the livelihoods of many veteran nannies. Once a down-and-out girl whom no one respected, she suddenly becomes the sought-after 'Auntie Song' whom nobles across the court scramble to curry favor with.