The Mad Hatter (2021)

Led by an unconventional professor, a group of four students venture into the legendary mansion of the "Mad Hatter," a figure tormented by mercury poisoning and sorrow. Reassured by the professor that the eerie, disheveled "caretakers" lurking within are simply descendants of inbred servants and that the Hatter has long passed, the students find themselves vanishing mysteriously. With each disappearance, doubts arise among the remaining individuals about the professor's supposed experiment being grounded in science, and suspicions mount that the Hatter's madness may not have ended with him but instead been unleashed upon the unsuspecting visitors.