Shen Qingtang, whose family was destroyed when she was young, was taken in by Pei Congzhi, the eldest son of the Chengping Marquis' family, and became a foster daughter in the Pei household, living as his nominal sister. Over the years, she endured unfair treatment and oppression within the Pei family. The only person who could be called her protective brother, Pei Congzhi, is also a dangerous figure, leaving her uncertain of how to navigate him. With the constant pressure from the Pei household wearing her down, Shen Qingtang decides to break free, leaving Pei Congzhi behind, and escaping from a life full of peril and uncertainty...