May I Ask Why the Demons Launched the Three Realms War?

Thousands of years ago, the war between the three realms destroyed the world and destroyed the world. In the end, the gods were the worst, with only five ancient gods and an ancient dragon who made a mistake... The human race requested to seal the spiritual veins, so they can only cultivate to the Tianfeng realm... The demon clan is trapped in Xumi Mountain... The demon clan seems to be completely wiped out... The human father and son asked: Why did the demons want to destroy the three realms... Are the ancient gods hiding something, or are they just ignorant... See how Mu Shuoyun and Hanhai Chuheng, father and son, press each other step by step... What choices did they make when faced with the end... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.