Modern-day girl Xin Yueying unexpectedly enters the world of an ancient romance novel and becomes Xin Si-niang, a woman facing a difficult fate from the very beginning. Determined to change her destiny, she relies on her quick wit and practical skills to stay by Shen Qingqi's side, improving his wheelchair and investigating suspicious matters for him. Along the way, she gradually discovers the resilience and sense of responsibility hidden beneath his cold exterior. From mutual suspicion to joining forces to overcome one crisis after another, the two face old cases, rumors, and turmoil in the capital. As they protect each other, they uncover the secrets of the Shen family and embark on a journey to find the truth and a new beginning.