On a stormy, snowy night, detective Chen Feng encounters a strange and mysterious case aboard a train. As he investigates, he discovers a connection to an old business scandal from seven years ago. A cleaner, Sister Liu, seeks justice for her husband, while the attendant Xiao Li silently watches over them. Chen Feng follows the clues step by step and exposes the real culprit, clearing the innocent through the power of the law. Justice never loses its way. When the train reaches its destination, all the evidence is handed over to the police, and the case of Chen Guoliang is reopened, resulting in his declaration of innocence. This story upholds the dignity of the law and the principle of procedural justice, conveying the message that evil can never triumph over good.