In her past life, the venomous medical expert Su Wan was betrayed by her most trusted junior brother and died a miserable death with her meridians completely destroyed and all cultivation lost. She is reborn as Shen Danggui, a useless concubine's daughter and abandoned daughter of the marquis's estate. Binding with a system, she relies on raising three children with mysterious backgrounds to extend her life, only to discover that the backgrounds of all three children are related to the person who betrayed her in her past life, and he has already been searching for her for a full ten years.