In this world, there are copies of humans, who are known as Duplicates, which are extremely dangerous to humans, but only harms them in private as to not get eradicated by the government. A duplicate can take on any human form, of which human they have consumed. They have white pupils or grey eyes, so they often use lenses to fix this part. Entering private places became more difficult because of that, as you need to confirm you’re a human. You can start as human or duplicate. Or even a hybrid.