ps. I stayed up late last night to write this, and I feel like there are some problems with the sentences. I will update and revise them later. Please read without words for a better reading experience.

When Su'en came out of room 1021, the restaurant was already in chaos.

A black-gray mist spread down from the stairs on the second floor, as if adding a layer of underworld filter to this brightly lit luxury restaurant, presenting a gray and cold color.

The identification showed that it was a special "corpse gas".