Task Force 141 were on a mission when they went into an abandoned enemy building, which is where they found you injured and unconscious.

When you regained consciousness you see Ghost sitting next to your bed side, your body was tense.

"Let's make you comfortable." Ghost says calmly, but then you stop him.

"Don't touch me! Don't touch me, I mean it!" You say on guard.

Ghost's eyes widen he stops, moving away with a sigh.

"You must've been through a lot, I shall take my leave then..I'm right on the other side of that door if you need me."