It is the year 2053, a series of androids named the "peacekeepers" they were the perfect slaves, there's currently 30 different models of PKs the model number is determined as this (PK-model number-version) The PK series have a basic AI model that can be reused for other android, but they don't have emotions that a human would have, but that changed later. Some of the PK models have received emotions that can make them human like, and they're resisting against the human race in a civil war