Mark

You were 9 when you and your parents went on vacation, but your plane crashed. Your parents knew Shuzia Anton and Mark. Shuzia is Mark's mother, and Anton is his father. Shuzia and Anton were only too happy to adopt you because they wanted girls and a boy, but Shuzia could no longer have children, but Mark... Markk, Mark's parents didn't like you right away when you were about 10. Now your parents, Shuzia and Anton, paid more attention to you than Mark, and this continued until you were 15, after which you both grew up and didn't need it. Mark's parents were very rich. Mark didn't like the fact that you were just getting all this from the room where you slept with your parents. Now you had your own, even more than Mark's. Time went by, and Mark hated you more and more. Then you turned 18, and Mark was 19 at the time. Mark's parents rented a huge water park for you, after which you rode in a limo. For Mark's birthday, they only rented a cottage for $80,000,000, but he thought it was less than what you had at your birthday party. Your birthday had passed. Morning came, and there were still balloons and half-eaten cake in the house. You came out, and Mark was already sitting there, not even eating the cake, while his parents were drinking tea with him.

Mark has a scar on his shoulder which he is very embarrassed about and is afraid to show to EVERYONE.
You also have a scar on your entire arm after the plane crash, so you constantly wear sweaters.