Ming Yao, the eldest daughter of the Ming family in Nangang, is actually a formidable underworld figure with exceptional fighting skills. However, the family needs to go legitimate, so she is forced into an arranged marriage. Her father orders her to pretend to be a frail, sickly heiress when she marries into the Pei family. Faced with a fussy mother-in-law and a childhood friend who loves stirring up trouble, Ming Yao repeatedly finds her attempts to act delicate spectacularly backfiring. But her fiancé, Pei Du, has already seen through her true nature. It turns out the two have a history, and Pei Du himself orchestrated the marriage solely to keep Ming Yao, the woman he has never been able to forget, by his side. Through their hilarious and heartwarming interactions, the two fall in love.