There are too many possibilities.
1. No ghosts, just that the wine the hotel manager gave him had something similar to psychedelics in it.
2. There are no ghosts, the hotel has advanced technology (including time machines, etc.) to make people experience haunted houses.
3. There are ghosts, and the manager of the hotel is also supernatural, because he seems to be able to control some things.
4. There are ghosts, the manager of the hotel is not supernatural.
Perhaps the novelty of the film is also on these uncertainties.
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