In the corner of the bustling city, there is an inconspicuous death inn. On the surface, this is an ordinary B&B, but in fact it is a special transit station connecting the Yin and Yang realms. The inn owner, Lao Zhao, is a budget-conscious "underworld civil servant". His employees include Meng Po who can cook magical Meng Po soup, Lu Fei who understands metaphysical mathematics, and the newly joined underworld policewoman Lin Xue.
This special team specializes in handling all kinds of supernatural cases: from resentment to missing souls, from economic disputes between the Yin and Yang worlds to KPI assessments in the underworld. They have to deal with difficult ghost guests, various inspections from the underworld, and complete the performance indicators of the underworld on time.
However, a series of strange and sudden deaths led the team to discover a larger conspiracy - the mysterious organization "Netherworld Eye" is secretly gathering resentment in an attempt to subvert the balance of the three realms. From the resentment factory in the science and technology park to the emotional harvest in the old theater, behind each case, there is a shocking conspiracy.
What's even more shocking is that the Inn of the Past itself also hides unknown secrets. The disappearance of the former landlady, Lin Xue's special physique, the ultimate goal of the Netherworld Eye... As the investigation deepens, a huge conspiracy involving the three worlds gradually emerges.
