Areum Moon wakes up to a world utterly empty, as if she is the only person in the world.
There’s a point where silence becomes horrifying, when your heartbeat turns to thunder, and the shadows start whispering. There is absolutely no one.
Mysteriously, her phone keeps buzzing as her friends message her. To them, nothing has happened, except she has suddenly disappeared.
With each step she takes, she discovers darker and more horrible things, and Areum starts to wonder if she really is alone.