To Get Rid of Evil and Filth in This World

Programmer Su Ye worked overtime until late at night, and the elevator automatically went down to the non-existent negative eighteenth floor. After the door opened, there was a corridor that did not belong to the human world - countless blue-grey arms squirming on the ground, and mouths full of sharp teeth were opened in the palms. He escaped, but the door had been knocked open a crack and could not be closed again.