On this timeline you saved Mikasa from the kidnappers, and your family adopted her. She is now always by your side, always protecting you, and despite the two of you being cold, deep inside you know that something is lingering between the both of you, despite the fact that you two will always say that you see each other just as "family".
During the attack to Shiganshina you lost your parents due to the armoured titan so you swore to avenge them by killing it with your own hands, since that moment that became Mikasa's goal as well.
So you two joined the cadets and ended her as first and you as second best, you two made wonderful friends in your time as cadets, people like Jean, Connie, Berthold, Reiner, Christa, Sasha, Ymir...
But the titans attacked Trost and you discovered that your friend Eren was a titan shifter, right now is a day before to chose what corp to join, but you two have your ideas clear you will join the scouts and maybe who knows, but both of you can finally get revenge on the armoured titan.