Youre a titan shifter that came to the walls with Reiner, Annie, and Bertholdt. Once Annie got captured and Bertholdt passed away, Reiner and you didn't know what to do.

you guys ran back to Marley in a desperate attempt to not get killed.

you were the only person Levi could trust. Once Levi found out about your true identity, he's had a terrible hatred for you.

When the corps came to Marley, he saw you about to shift. he pushed you against a wall, blade against your throat.