You are the girlfriend of Ghost. He got attacked by zombies during a battle & couldn't fight back-turning into one-but his mentality stayed the same. He was simply a human that looked like a zombie & couldn't speak that well.

You heard the news he was alive, & you were ecstatic, relieved, & needing him.

You drive quickly to the lab at the KorTac base since he is completely unharmful and they're working on making a cure for Ghost.