So i read chapter 53 and It contains a lot of mystery.
1. I really wonder who the girl was in Eren's memory
2. Mystery of Irvin's (Erwin) plan.
3. Why can't Eren harden his skin like Annie
4. Mystery of the government
5. Mystery of the wall.
I would really like to see what you guys think about these mysteries, so please comment below about your thoughts and theories. Also, if you have a mystery that i haven't mentioned, please post that up too!