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The film opens in a dark and eerie forest, where a grand mansion once owned by a mad scientist, Da Vinci, stands ominously. The plot kicks off as Zhang, who works as a tour guide in the now-museum, tries to scare a group of tourists with a ghastly tale about the mansion's former occupant. His boss, Mr. Wong, scolds him for his increasingly ridiculous stories, urging him to be more professional. Undeterred, Zhang continues his duties.
However, while exploring a restricted area in the basement, he accidentally triggers a catastrophic event that leads to his shrinkage—an incident involving a toy car and electric currents that violently jolts him into a new reality. Once small, he quickly learns he must navigate a world teeming with dangers, most notably, gigantic insects.