Hari and Duri move into the Mysterious Apartment and meet Simbi, a two-headed goblin deity who has lived there for over a hundred years, forming a bond and becoming a great team for vanquishing evil spirits. One day, they discover a mysterious cave in the forest. The cave's power transports everyone back 22 years in time, where Hari and Duri unexpectedly meet their mother as a child and join her on a treasure-hunting adventure. Meanwhile, another spirit resembling Simbi, named Gimbi, makes his first appearance!