Return from Prehistoric Times: the Takeaway Emperor's Journey to Cosmic Dimensionality

A cow-horse beater who was delivering food was mistakenly killed, and he time-traveled into the ancient demon ancestor Rahu, and discovered that the so-called heavenly way was actually a conspiracy to enslave all living beings; he rebelled against Nuwa, recruited Tongtian as a disciple, and used modern thinking to subvert the ancient world. In the end, he woke up and returned, only to find that he had brought back ancient cultivation skills that were enough to stir up the modern world - and that time-travel was never an accident...