Voice of Silence follows a mute kidnapper, Tae-in, and his partner, Chang-bok, as they navigate the dark underworld of crime. After a botched job, they find themselves taking care of a kidnapped girl and struggling to find a way out of their predicament. As they dive deeper into the criminal world, they discover dark secrets and unexpected connections.

After sudden unification, the Korean peninsula is struggling with economic chaos. An old laborer, Chan-ki, receives a new high-tech telephone from his son in China and goes to seek help from his neighbor, as he does not know how to use it.

At a remote train station covered in heavy snow, a station master Gap-su is facing the last day of his life-long dedication to the station. Devastated by the sudden layoffs, Gap-su keeps waiting for his young replacement, who still hasn’t yet come. As the hush reigns throughout the station, Gap-su sees the breaking news that dozens of convicts escaped from the overturned prison bus, and just then, a young man walks into the station claiming himself as the one Gap-su has been waiting for.