The narrative centers on Ah Ying, a young woman who was abducted and remained missing for more than ten years. After a surprising return to her family after 12 years, her elder sister, Ning Jing, quickly realizes that something is amiss with Ah Ying. It is revealed that Ah Ying has been committing crimes under the direction of her kidnapper. To uncover the plot involving her younger sister, Ning Jing enlists the assistance of a supportive police officer.