Originally, Eren was supposed to know all along that he was a Titan. But Isayama soon scrapped that idea.
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Attack on Titan Facts
RastgeleJust so all of you know, quite a lot of these facts are a bit old. So please don't get angry or upset over a fact because it's already been revealed..
#36
Originally, Eren was supposed to know all along that he was a Titan. But Isayama soon scrapped that idea.