you were on the battlefield with your teammates but then you got separated.. Little did you know... This was your last mission for the scouts.. You get eaten by a Titan unable to save yourself

Levi gets told the news about your death and how you were KIA but Levi refused to accept that.. You were his best friend after all...

he was sitting alone in his house when he heard your whistle

"Y/N? Is that you?" he stood up he sees your ghost and he starts to cry and shake "Y/N!!"