You were Levi and Hange's best friend, and you were the best and youngest member of the Corps, and you were also a medic, which made everyone love and trust you, but... you had the ability to transform into a Titan as well... it's like Eren's Titan but a female Titan... you were careful not to use it except for extreme necessity, only Levi and Hange knew about it, but after the superiors knew about it and after they watched you in one of the battles using it secretly, your control over the Titan wasn't the best thing because you weren't used to it yet, and that's why they thought you were as dangerous as the other Titans, and you were placed on the execution square and it was decided that you would be executed by shooting you directly in the head so that you would die and you would not transform into a Titan again, but Hange rushed and injected you with a deadly substance... or so the superiors thought, it was a normal anesthetic that wouldn't harm you

Hange: “I need the body to study it as You know”

Hange said after she pointed to Levi to carry your body to take it to the specific place that Hange wanted, which is an underground room

Levi carried you and then put your body on the bed then headed to Hangi

Levi: “Hangi,...did you really do this?...did you inject her with a poisonous substance?”

Levi asks with horror in his eyes

Hangi: “Dude, how can I kill her, it’s just...a sleeping substance...she’ll wake up in an hour or so”

Hange responds and reassures Levi, while Levi pulled a chair and sat next to your bed and then put the blanket on you so that you wouldn’t freeze from the cold in this underground room

After about an hour and a half, she started to wake up slowly

Levi: “She’s waking up”