Hybrids in the world

Imagine a world where parents are giving up their children at birth just for the money, or they can't support them, well that's the world Wilson, and scarlet live in. They were made into hybrids in a laboratory. 200 babies 4 Generations of hybrids 2 types of hybrids, code x, and hollows. Doesn't it seem like the number 20042 is spacial? Well I guess you'll have to figure that out between a secretive brother, a curious sister, and a psychotic friend.