Young man Lin Hao goes to a post station to mail an important document, but encounters abnormal weighing data and is asked to pay a high fee. He checks the package on the spot, and is instead harassed and shirked by the staff. Facing pressure from the post station, public opinion misleading, and multi-party obstruction, Lin Hao does not compromise, calmly collects various types of evidence, and actively cooperates with law enforcement departments to carry out investigations. Under the impartial handling of law enforcement officers, the inside story of the post station's illegal operations is peeled back layer by layer. Lin Hao adheres to principles, defends rights in accordance with the law, and guards the legitimate rights and interests of himself and the general consumers.