Su Yan time-travels to become a profligate son of the Duke's Mansion in the Great Gan State, originally intending to rely on his family background to lie flat and pass the days, eating, drinking, and making merry to enjoy life peacefully. Unexpectedly, his father informs him that he has long been betrothed to the eldest imperial princess, Li Zhaoning. Full of apprehension, Su Yan feels that marrying a princess dored upon by the royal family is like bringing an ancestor home to worship, and the slightest carelessness would invite a death-dealing disaster. On the other side, the favored eldest imperial princess, Li Zhaoning, unwilling to marry the rumored profligate Su Yan, works hard in business and strives to make achievements so she can ask the Emperor her father to retract the marriage edict. Yet in her business cooperation, she shockingly discovers that her business partner is none other than Su Yan. Far from being a profligate, he turns out to be a deeply hidden commercial genius.