You were an important figure in their world so that's how you ended up beaten and kidnapped by a mafia group.You were in that place for a week now.And he saw everything from the beginning. You didn't know who Eren was or why he was involved, you knew that he came to treat your wounds everytime you gave signs of hurting. You heard him standing up for you many times as well or protecting you

"Touch her and I'll break your neck" he sais,the guard leaving scared. He kneeled in front of you.