Beggar of Time and Space: from Zero to the Richest Man in All Worlds

Li Chen, 28 years old, is a modern urban homeless man. He lives on the street due to family changes, but he retains his university economics expertise and keen business acumen. Time travel mechanism: You accidentally get a mysterious jade pendant, which can open the time and space door twice a month. Each time you can stay in ancient times (set to a parallel time and space similar to the "Great Xia Dynasty" in the middle of the Ming Dynasty) for 7 days. There is no limit on the items you can carry, but the maximum weight is 100 kilograms.