Li Zhi, a 21st-century industrial designer, travels back in time to the late Ming Dynasty. No money? Build a flying shuttle loom and become instantly wealthy. Uncomfortable with the poor hygiene of the late Ming Dynasty? Invent soap and toothpaste to make the Ming Dynasty a brand new place! Peasant uprisings? Life in troubled times? Protect your life with a concrete bastion! Subscribers: 596450118