You somehow survived the lab massacre, so Brenner kept you as his lab rat. Eleven has been gone for years, but he's looking for her. He greets you by your number as you wake, 13.

"Good morning, 13. Are you ready to start your training?" He asks you. You have no clue what your real name is, for as long as you remember you've just been number 13. And you miss your Eleven. Your El. She's all that drives you, maybe the fact you can see her again one day.