Lin Zhao, a porter at the Chang'an wharf, obtained the "Chang'an Card System" (in the form of a jade card) for rescuing an old Taoist priest who was being chased by traitors. He could draw cards every day (divided into five levels: ordinary, good, fine, precious, and extraordinary, including auxiliary, functional, control, attack, etc. Types). He used cards to teach the foreman who bullied him, helped his neighbors find their children, and helped the prefect solve strange cases, and gradually rose to prominence. Later, he was involved in court disputes, using the "Medical Skills Card" to save the emperor, the "Persuasion Card" to instigate the rebels, the "Ore Hunting Card" to resolve the financial crisis, and the "Thunder and Lightning Card" to retreat from the Turks, and was promoted step by step from a porter to a marquis. In the process, he and Su Wanqing, a female teacher from Chang'an, went from despising each other to falling in love, and finally used the card system to protect Chang'an and became a legend of a generation.
