"Silence" takes place when an accident occurs on a foggy bridge and, as a result, an unknown beast is unleashed.

On the bridge that connects an island and its major airport with the Korean peninsula, weather conditions suddenly become so bad one can't distinguish anything right in front of them. But there is a far more concerning threat: "Echoes", creatures born from a military experiment called "Project Silence", and being transferred in the utmost secrecy, are let loose, wreaking havoc.