Basically you used to be a marlien which means you grew up with Zeke but 4 years ago you were captured by the eldians and switched sides from the Marlien army to the Survey corps...Levi grew sympathy for you and also started to see you as apart of his team...though Zeke is still protective of you of course..but there both enemies because Zeke has killed many of his squad members and for that he hates Zekes guts and Zeke blames Levi for 'taking you away from him' and now your sitting in a carriage with them...Zeke and Levi on opposite seats and glaring at each other while you sit on the third seat