I'm Working as a Sleep Tester in a Haunted House.

Summary

In a malfunctioning elevator, three characters find themselves descending uncontrollably past the building's supposed lowest floor, reaching the mysterious "negative eighteenth floor." As fear sets in, they realize they're trapped in an otherworldly space, with eerie phenomena occurring outside the elevator. A ghostly hand attempts to drag one of them out, revealing the supernatural danger lurking beyond. Just as two characters are compelled to exit, a figure named Zhou Yu Hui intervenes, warning them against looking outside and revealing that they are in "the 18th Layer of Hell." The tension escalates as they confront the unknown peril surrounding them.

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