The film tells the story of a puppet troupe actor named Sega who was about to marry his fiancée, Ubi, during the Republic of China period. However, after he brought a mysterious puppet home, he died that night, suspected of suicide. Ubi, who was grieving but refused to accept the suicide case, and the police officer Chao Yuan, who was skeptical about the case, decided to continue investigating the cause of Sega's death. With many clues intersecting, the shocking secret behind the puppet gradually emerged...