After your parents both died when you were 5 you ended up in an orphanage, and Zack's parents, adopted you when you were 7. You grew up with Zack, his parents treated you as if their own and you had everything you didn't have before, Zack is 4 years younger than you, you were his role model growing up and he looked up to you. After you both grew up and turned ro adults his Obsession with you began.