Based on "The Classic of Mountains and Seas", it combines ancient mythology and suspense puzzle solving to build a "secret realm of mountains and seas" hidden behind the real world. By deciphering fragments of ancient books, mythical beast totems, and secret realm mechanisms, the protagonists gradually uncover the shocking secrets left behind by the ancient gods—a crisis of "imbalance of heaven" that spans thousands of years. The forces involved behind this include both the surviving tribes of alien beasts from ancient times and mortal careerists trying to usurp divine power.
