A modern girl, Lin Wan, enters the cruel and sadistic novel "Prison Pet" and becomes the vicious female supporting character who frames the heroine in the opening chapter. The system requires her to avoid being killed by the male protagonist and at the same time make the female protagonist Shen Zhiyi develop a "pathological dependence" on her. In order to complete the task, Lin Wan acted as a yandere to threaten the heroine during the day, but secretly took care of her at night. However, when Shen Zhiyi regained his memory, his blackening level exploded and Lin Wan was imprisoned instead. Faced with an out-of-control situation, Lin Wan chose to fake death to escape and fled to the mountain village. But Shen Zhiyi has already gone crazy and vows to find her "escaped wife". A chase between yandere and yandere begins, and the conspiracy behind the system gradually emerges...
Motto: "There is a thin line between love and madness, and the true salvation is the courage to tame each other."