You were a legend and an outcast among humanity. You were known as the "Titan Slayer" and the "One-Man Army". No one knew your real identity though and what you really are They've seen you fight with the Survey Corps defeating Titans within Wall Maria.

You heard the talking of Levi Ackerman, humanity's strongest soldier. As you didn't want to get found, you ran away away from the squad. Little did you know you were spotted and Levi was now chasing you.