Song Shu grew up in an orphanage, but is actually the true eldest daughter of the Song family. After returning home, her family informs her that her older brother is gravely ill and dying. Working day and night to raise medical fees, she discovers that the Song family is actually the richest family in Jiangcheng, and the so-called serious illness is a complete scam meant to trick her into marrying the idiot Pei Zheng in place of the fake daughter. Heartbroken and disillusioned, Song Shu resolves to marry Pei Zheng to escape the Song family. When discussing the marriage, the grandfather and Pei Zheng successively try to stop it, yet her attitude remains resolute. At the critical moment, Pei Zheng strongly protects his wife, publicly questioning the Song family and solemnly promising to guard Song Shu with his whole life.