We don't belong to the same world [Bertholdt Hoover x Reader]

You don't belong to the same world.You were opposites in the world of Attack on titan, you from Paradis, he from Marley. Yet you found each other, but life is unfair in this world. Death is more likely than love.
21st century. Earth.
You still have that same dream. The tall, dark, shy but treacherous boy you fall in love with, every time. Yet at the end of your dream you die, and so does he. All the time. Nothing changes.
You don't come from a wealthy environment and sometimes you even use your agility to get into certain houses, that are often unoccupied. "Anyway, in the summer, these rich people are never there". But that summer, in the house you had chosen, someone was there. What happens when the owner of this house finds a thief? Especially when that owner looks just like the boy in your dream?