In the modern city, two genius scientists Fu Yan and Lou Xing restarted the "Return to Ruins Agreement" that failed five years ago, but discovered that there was an even more shocking truth hidden behind the plan - they were both inheritors of the genes of the ancient beasts from the Classic of Mountains and Seas. In the process of exploring the secret of immortality, they gradually unravel the mystery of their own bloodline and become involved in a supernatural war that spans thousands of years.
