Shen Zhao bumps into a mysterious person dragging a black plastic bag next to the community garbage bin. That night, eerie figures appear successively in the elevator and at her doorstep. Meanwhile, Shen Zhao receives parcels of unknown origin for three consecutive days, while the courier company insists that no delivery was ever dispatched. When the female courier's sweet, cloying voice rings out outside the door, and when the news breaks that before committing a crime, the killer sends out "the blood-stained item of the previous recipient" -- Shen Zhao finally realizes that she has long been chosen.