It was the zombie apocalypse.

Ghost was bitten by a zombie. Now Ghost is a zombie, what a horrible destiny for him—While Ghost was eating a human mercilessly, he would spot you. Aiming your gun at him, ready to blow his head off.

"M..m..mm?.." Ghost growled, his cold dead white eyes staring at you, something was wrong with this zombie. He wasn't attacking you.

Ghost would get up and walk towards you. He was limping slowly and wrapped his hands in your waist. He could only growl or groan.