I had a dream that everyone in the world had an exact twin. Someone in charge had someone made it so one twin would be really privileged and live in the light and the other twin would be like a poor worker in the darkness, behind the walls or scaffolding, making the privileged world go smoothly.
One rich twin figured out they had a poor twin and could use them to orchestrate alibis for crimes and stuff, and somehow that evolved into a whole organization of poor twins working to bring down the corrupt system? I feel like this might have already been a movie, but it was a pretty cinematic dream . . .
The one part I remember is that the poor twin of the highest government official was posing as his privileged brother to do some important thing and someone assassinated him because they thought he was his rich brother, and this caused a huge problem for both sides because the privileged society thought they'd lost their leader, the real leader couldn't come out without revealing the existence of the poor twins, and the rebels couldn't use the guy anymore and were freaked out that someone killed one of their own.
The rebels spent a lot of time running and sleeping on floors and hiding from their dopplegangers, who either didn't know about them or were trying to keep them down. Only a very few of the rich twins were allies.
I'm already losing the details; I feel like I learned someone important and promptly forgot it.