You met Levi at the survey corps, and look at both of you now: married with a little girl

Years ago the survey corps disbanded after defeating Eren and winning the battle, since then you and Levi have settled down and started a family

Today Hange gave you a drink, specifically one of her experiments. Being bored and feeling stupid you drank it and instantly passed out. Later waking up in front of the survey corps HQ…and you wearing your old survey corps uniform…