The dark underground city hides shocking secrets. Cleaner Su Wantang was gifted with the ability to hear the whispers in the walls, and unexpectedly discovered that the city was actually the digestive tract of living creatures "Glutton", and humans were harvested as nutrients.
In order to survive, she united with the sober people to crack the secret code left by her grandfather and fight against the management's "purification agreement".
In a desperate situation, she awakened Taotie's consciousness, reached a symbiosis contract, and led the survivors to escape from the underground and return to the surface.
Facing mutated creatures and a broken world, Su Wantang joined hands with her partners to rebuild her home and open a new era of coexistence between humans and the spiritual tribe.
