Billionaire heiress Song Mingwei of the Song Group has mysteriously disappeared. In a bid to seize the Song family fortune, Song Shumo tracks down Ruan Tiantian, a girl who looks identical to Mingwei. Tiantian, betrayed by her boyfriend and abandoned, is struggling to pay for her adoptive mother’s medical treatment. Song Shumo offers her a deal: impersonate Mingwei and marry into the wealthy Lu family to infiltrate their empire and steal their core secrets. In return, he promises her enough money to save her mother. Forced into a flash marriage with Lu Yanshen, the ruthless CEO of the Lu Group, Tiantian begins her act—humiliating her cheating ex, mastering high-society skills, and playing the perfect heiress. But just as she starts becoming more like the real Mingwei… the true heiress returns.