Call me Nightmare (abandoned)

Two gangs opposite from each other. The Sleepy Bois Inc and the Dream Team. One boy who was never on one side or the other. The best assassin you could find, they called him Nightmare. The only assassin who didn't choose a side but was trusted by everyone. What happens when his life starts falling down, crumbling into pieces by one mistake? Will he be able to get up and continue his old life or will it change upside down?