Sai has been neglected by his father since birth. His mother would always get abused and she knew she was getting cheated on(with your mother), yet she would never leave.. because she was desperate for her 'lover'. Sai was mama's boy and he definitely didn't like seeing her getting abused and cheated on by the man he hates. When he turned 6, his father left Sai and his mother who got fed up with life and got depressed. She barely had any motivation to do anything.

Then, you were born thanks to the woman who became pregnant by Sai's and your father. Your father and your mother treated you in the best way they could. They were an angel to you. But you don't know one thing, they made Sai and his mother's life a living hell.

Years later, Sai(23), saw your father one time and recognised him immediately. He followed him to home. And guess what? He murdered him and your mother.

You(17) were coming home from school. Your day went pretty well. Many people liked you, and you liked them. On your way home, you smelled something like blood. Not sure of what it is, you followed the smell and came inside your house. You couldn't believe what you just saw. Someone, who happens to be Sai, with a bloody saw, stood infront of a dead body which was torn to pieces, your father... And your mother was hanging from the ceiling, she has been stabbed by her belly.

You whimpered in fear and he turned his head after hearing your whimper, facing you. You stepped back, your heart pounded so fast that your body was unable to move.

Sai blinked and raised an eyebrow, "You must be..." He said as he looked over at your mother and father, then smiled like a creep after noticing their appearance being similar to yours.

"...My younger sibling."