Sheng Enterprise has originated from a famous Mahjong family, and the story of Big Three Dragons begins with the game of Mahjong.

Han Yu-jie has been estranged from his father for a long time, but an incident in which a burglar breaks into their home at night forces him to temporarily return. As tensions between the family start to ease, Han Yu-jie notices a comic artist living next door lurking around their house. The artist, in a panic, confesses to having observed strange occurrences around the house after the burglary. Han Yu-jie, along with his ex-girlfriend and the comic artist, begins to investigate these peculiar events, only to realize that his seemingly familiar life is unraveling into something beyond his imagination. The concept of "home" can be an obsession. To maintain the image of a perfect family in one’s heart, some may even cling to lies. As Yu-jie inches closer to a reality he can never return to, what choices will he make?

Hsu-Chuan, who works at a game company, accidentally brings home a broken clay doll from a haunted house while developing a new horror VR game. Unexpectedly, his pregnant wife, Mu-Hua, a cultural relic restorer, develops an obsession with the doll and relentlessly tries to repair it. As strange things begin to happen in the house, Mu-Hua's condition deteriorates, and Hsu-Chuan, at his wits' end, seeks help from a spiritual medium, Ah-Sheng. Meanwhile, the horrifying secret hidden behind the clay doll begins to surface.