To uncover the truth behind her father's death, Yu Xiaotao returns home pretending to be a mentally impaired "foolish daughter." There, she faces relentless harassment from her stepmother, Yao Ke, and stepsister, Yao Jiajia, who covet the family fortune. By playing the fool, she avoids their attempts to harm and test her while secretly gathering evidence that Yao Ke embezzled the family assets and murdered her husband. Along the way, Yu Xiaotao cleverly exploits the conflict between mother and daughter to turn Yao Jiajia against her mother, and enlists the help of Xu Yi, one of her father's former subordinates. At crucial moments, including shareholder meetings, she repeatedly turns the tables and breaks through their schemes. As the evidence gradually comes together, Yu Xiaotao's battle for revenge and her father's inheritance grows increasingly fierce. The ultimate showdown for truth and justice is about to begin.