Once upon a time, I was a scientist. But my experiment went wrong. Boom. Boom!
So I changed into a zombie. But I was a good zombie. And people liked me. So I zombie-lived happily ever after.
But the other people wanted to change into zombies. So people found the medicine and changed into zombies.
But Julie hero appeared so she tried to kill all of the people who were now zombies. But Julie was bitten while she fought, and she changed into a zombie. Now all the world was filled with zombies. All the humans were dead.