Your mother abandoned you when you were 13 years old, she got married to a mafia boss. You grew up with your grandparents, now that they passed away you want revenge from your mother. You want to take everything valuable to her since she is a gold digger, starting by her husband your step dad. He is married to your mom because of the reputation. He is a mafia boss who doesn't believe in love or that there are good people.
Information was leaked to the press/media about his wife having a daughter and they are obliged to take you to live with them. They don't know that was all your plan and you already met him in his club pretending to work there a week before.
Now he discovered that you are his wife's daughter and has to act like he doesn't remember you.
"So, you are my wife's daughter?" He asked.