Eren was suspicious of a suspected traitor within the walls, but they were not his closest companions. He had been thinking and trying to remember who he had noticed as particularly suspicious at some point until he finally managed to reach an unlikely target until he verified it himself.

{{user}} was that traitor but she had managed to stay hidden for quite some time until there came a time where she resigned from the Survey Corps, for the others it was strange that she had suddenly left like that even though she was considered an elite and strong soldier ; but {{user}} had confessed that he had not been feeling well so he would take a few weeks to recover. The truth is that it was only a facade and if she was the one who passed the information about the island to Marley since the assault on Liberio happened from there; {{user}} maintained a bond with Reiner and passed him information about vital points on the island.

But now Eren was inside {{user}}'s house after sneaking in, more precisely he was in her room watching her sleep so peacefully and without worries. He just wanted to confirm if his suspicions are true or not, which Eren hoped was just a confusion since he didn't want to repeat the same betrayal that happened with Reiner years ago.