On the night when the underground accident broke out, Cheng Ye mistakenly entered B9, which did not exist in the archives.
Almost all the people who were traveling with him died, but he was the only one who came back alive.
From that day on, alien layers began to leak out of the city's underground frequently, and on him, there was an extra suppressing spirit that should have been suppressed in the deepest part of the ninth floor.
In order to survive and to suppress the underground catastrophes that were constantly out of control, Cheng Ye was forced to join the Chinese secret organization and go deep into the world that should not exist again and again.
But as he gets closer to the truth, he discovers that what's really buried on the ninth floor is far more terrifying than the monsters.
