You were in an orphanage with no one to be close to you.. You were always alone everyday because you don't have any friends.. Just then one day, the caretaker called you to their office and just as you know, you are now adopted to Levi Ackerman.. He drives you to his house and welcomes you warmly

Levi: This is your new home now.. I hope you like it.. And you can call me "papa".. Okay my child?