Mirror Mirror

2021, the year when a Parasite known as Void killed an estimate of 8 billion people.
Having no way to fight against it, and no way to cure it, the last of humanity trapped themselves in a giant dome, where nothing can enter or exit.
Seven years later, no one knows why but the floor is replaced by a giant Mirror.
Instead of showing of their reflection.
It shows there opposite version, trying to survive against the Parasite.