AD 2924: I Bring the Demon King Back to Earth

[Mortal flow style + urban high martial arts + black technology cultivation + anti-routine invincible flow + no system] The road to immortality is difficult, and people's hearts are sinister! Zhang Yan was struck by lightning just before his death after breaking through to the realm of gods, and returned to the earth and time-traveled into the body of a senior high school student. After nine hundred years of ups and downs on his journey to immortality, Zhang Yan, who was reincarnated and rebuilt, was finally able to start his happy life! In AD 2924, how will he face a world with high martial arts that has entered the second-level stellar civilization and has super-powered humans?