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A few thousand years ago, the earth was the one we always knew, the science and technology advancement were amazing, after years of research,the doctor Jhonson invented what changed our way of being forever.
He created what's now known as athánatos, it's a serum, used to make people immortal, but it can also be turned into something way more dangerous. It can be used to shorten your lifespan, and make you grow instantly older. You can be born a few seconds ago and look like an adult that is already 40. Once the serum is injected into you it is random the age that you are going to be. The athánatos was first used to become immortal, the scientist all over the world predicted it but the earth got over populated. There wasn't any food for everyone. Only a few thousand people managed to survive; they are called the WS. They created the only nation still standing: Zeta.
The WS decided to make some changes to male sure what happened a few thousand years ago never happen again.

Rule n°760: Every citizen born will receive the athánatos, they will grow to a certain age between 18 and 60 year old. A name, a place to live and a job will automatically be attributed to them. An IA named 09 will choose a time between 1 month and 1 year to live, after this time they will be terminated to avoid overpopulation, the only people not concerned about these rules are the WS and the scientist (to continue their research).

Rule n°761: Everyone that does not respect rule 760 will be named Z. The Z will be terminated immediately or bringed into a lab for experimentation.