The night an underground disaster erupted, Cheng Ye accidentally stumbled into B9, a level that didn't exist in any records.
Almost everyone with him died. He was the only one who made it back alive.
From that day on, anomalous layers began spilling into the city's underground with increasing frequency. And on Cheng Ye's body appeared a guardian spirit that should have been sealed deep in the ninth level.
To survive and contain the underground disasters spiraling out of control, Cheng Ye was forced to join a secret Chinese organization and venture again and again into a world that should not exist.
But the closer he gets to the truth, the more he realizes that what's buried on the ninth level is far more terrifying than any monster.
