The Midnight Inn is a hotel which could connect Yin World (the dead) and the Yang World (the live). One day, several groups of mysterious visitors appear simultaneously in the Midnight Inn with their own respective purposes related to a unique corpse, which leads to the unraveling of truths behind several unsolved cases from over a decade ago.

The Midnight Inn, a place that operates around midnight, serving as both a mortuary and a rest stop, reopens after ten years, drawing in unexpected guests. Each one claims a strange connection to a corpse that's been dead for years, giving rise to a complex weave of enigmas.