While gathering medicinal herbs during her graduation trip, Xin Youran accidentally falls off a cliff. When she wakes up, she discovers that she has transmigrated into the body of Blood Shadow, the number one female assassin of the Great Liang Kingdom! To her surprise, the person lying beside her is none other than her original body's assassination target, Crown Prince Mu Yuan. After the two are set up and subsequently rescued, they are mistaken for a married couple who eloped together. To secretly investigate the truth, Mu Yuan pretends to have lost his memory. Meanwhile, Xin Youran plays along as his devoted wife to save her own life, secretly plotting her escape. But during their flight, she unexpectedly makes a fortune by cultivating flower fields and building a brand, leading the villagers to prosperity. And through a series of twists and turns, she ultimately becomes the Crown Princess!