Wen Xu, a top lawyer who retired three years ago, was peacefully accompanying her child in life, unexpectedly her son suffered an accidental fall from a building and was injured at school. To evade responsibility, the school authorities united with the at-fault parents to seal surveillance footage and conceal the truth, attempting to shirk responsibility. To seek justice for her child, Wen Xu used the dual identity of a mother and a lawyer to defend her rights according to the law. Along the way of defending her rights, she was repeatedly obstructed in secret by her old enemy He Zheng, who fabricated evidence, spread rumors and slandered, and framed her in every possible way. Wen Xu steadfastly adhered to the bottom line of legal principles, step by step gathering evidence and counterattacking in court, eventually winning a one-yuan compensation and a public apology for her son, and also successfully exposing He Zheng's old case of fabricating evidence eleven years ago, firmly guarding the rule of law and fairness, and defending the baseline of justice.