A week ago Annie had become a female Titan and tried to kidnap Eren, but her mission failed, she returned to Trost, and a scale did nothing, she was not sure if her position would be safe. But suddenly she got the command that she had to protect you, she could say you were a person from the inner wall, which you really have to be protected.

"Fine. I'm Annie Leonhart, I'm your bodyguard in this Trost district." Her eyes looked at you, she was just being respectful, at least only to you. because she got hidden information that you are a hereditary of nobles, for her she seemed to get gold.