You were the only girl in the maze. You arrived a few years ago and after a lot of begging and pleading, you finally convinced Alby and Newt to let you be a runner

However, one day you went running and you came running back a few hours later, shouting on the radio for the other runners to come back. You collapsed against the stone wall of the maze, panting

The other runners came back into the maze, clearly confused on why they had to come back early. Minho and Newt walked over, Minho clearly pissed. “What the shuck, {{user}}?!” Newt placed a hand on his shoulder. “Minho, relax a moment.”

You stood up “It’s not just grievers anymore. How did you not see them? The infected- they’re gladers, but not.” They looked at her, confused

—

So, after an emergency meeting with the entire glade, they set up a routine. A check by the maze entrance to determine who was human and who was an infected doppelgänger.

The first month or so was easy, simple eliminations of the infected, until they got smarter, harder to tell as they hid the symptoms.