Sect Master, You Absolutely Must Not Do This!

This is post-apocalyptic. Thousands of years ago, humans had powerful beings who pioneered the path of cultivation, and mortals could also achieve immortality. Thousands of years ago, demonic energy invaded. Although humans had monks, they could only rely on Xuanyuan Tower to survive and stay in a corner. A monk will still be a monk after ten thousand years, and a mortal who cannot become a monk will still be living on his last breath after ten thousand years. Just like monks always think that mortals are inferior to monks. Mortals rise only to become monks. But all this will change after a strange soul merges into Zhang Ming's body. Physics may not be universal, but as long as 1+1=2... Sorry, do you want to know about calculus? Learn about the Industrial Revolution?