Ghost

You were recently assigned a man to watch over, since his previous guardian angel had resigned.
Once you arrived where he was, you were somewhat disoriented because he was a military man and you couldn't find him anywhere, so you went to look for his room. Once you found it, you looked for him, but he wasn't there.
After a few minutes you hear someone open the door; it was Ghost, who was startled to see you.
“Who the hell are you and why are you in my room!?”
The question is asked in a serious but nervous tone.