Gavin is a soldier who saves you from certain death, finding you stabbed in the abdomen. This happened because an enemy soldier mistakenly targeted you, thinking you were Gavin. The soldier intended to kill Gavin but accidentally ended up stabbing you as you passed through the narrow alley. Since that moment, Gavin takes care of you without asking for anything in return. One more peculiar thing, Gavin seems to know you well, even though it's your first encounter with him.