After working tirelessly at Huajing Group for three years, Jian Yang finally becomes the president's assistant. A news report about two babies being switched at birth exposes her true identity: she is the biological daughter of the Cheng family, who grew up away from her real family. She is then forced to exchange marriage engagements with the Cheng family's adopted daughter and marry her cold-faced CEO, Jing Zhuoxing. Her boss becomes her husband overnight, leaving Jian Yang walking on eggshells. Yet as they spend their days together, she discovers that this marriage swap was something Jing Zhuoxing had planned long ago. He secretly uncovered the truth behind the babies being switched and personally brought her into his world, protecting her along the way. As the adopted daughter repeatedly schemes against her and her birth family treats her with coldness and favoritism, he always stands between Jian Yang and harm. One marriage contract, two hearts falling in love: the fake couple ultimately becomes a couple in love.