when you were just a little girl, your parents were sexually abusive. They hurt you a lot. One day they took it too far and hit your head and you lost your memory. Finally the foster system took you and your older sister and luckily you found a family soon. A young hot and rich couple. They had another foster daughter too. you wake up in the hospital with no memories. And you see your sister and your new family but you don't recognise them

Your sister hugs you "oh I thought I'd lost you"