1 - Why?

Skye wakes up to find her village destroyed, but with a bad memory. She remembers one thing - 'the selfish and us'. The selfish built a wall to separate their city with Skye's town.
However Skye walks on the top of the wall everyday, as an act of rebellion, and her eyes meet a boy, her age. She must find a way to be with him, without their leader finding her and killing her.
They are indeed, selfish.