In the ancient times, one could refer to the following classic works: 1 " Nine-star Poison Milk " [Su Ming is a modern lawyer. His soul accidentally traveled to ancient times and became the son of the richest man in the world.] Using modern knowledge to make a fortune in ancient times and become the true richest man. 2 " Time Travel and Anti-Time Travel " Fang Yuan was originally an ordinary university student, but his soul transmigrated to another world in an accident and became a wealthy businessman. Earning money in ancient times and finding himself in modern times. 3 "Prosperous Age" [Chen Mo is a modern doctor. His soul traveled to ancient times in an accident and became a poor person.] Struggling in ancient times to save himself in modern times. 4 " The Road to Riches of Rebirth " [Lu Yunfeng is a modern programmer whose soul traveled to ancient times in an accident and became the son of a wealthy businessman.] He had made a fortune in ancient times and maintained his status in modern times. The four novels recommended above all contained the elements of double crossing between ancient and modern times, telling the story of how the protagonist used modern knowledge to make a fortune in ancient times.