Eren was quite frustrated that he couldn't use the identification skill on his woman. Her words made him feel as if she had a really unique identity.
Before entering the throne room, he had asked his guards about the exact identity of the woman. While asking the question, he pretended as if he was asking to test their knowledge to understand how much they knew about him.
To his surprise, the guards were just as ignorant about the girl's origin as him. All they knew was that she was engaged to him and had visited the Royal Palace once a few years ago with her father.
Eren simply looked at the woman, growing more intrigued about her confidence. As per the usual template of the main characters, he was going to be humiliated with broken engagement.
After that, he had to challenge her for a battle in the future where he was going to show her that he wasn't trash. Unfortunately, that was the problem in his case.