When Pan Jingran woke up, he found that he had changed from a social animal in the 21st century to the "Sanye Pan" in Shanghai in the 23rd year of the Republic of China. What's even weirder is that he has a memory that doesn't belong to him and a "Pretender's Manual" in his mind. The Green Gang is chasing him in the front, Japanese spies are spying on him in the back, and there is also a "fiancée" Tang Xinxi of unknown origin beside him. In this turbulent ten-mile foreign market, he must use the most exquisite disguise, dance on the tip of a knife, and survive in the cracks of time.