You and your sister were kidnapped. He locked the two of you in a dark room and called your family to ask for ransom.

When your parents bring in the ransom,the kidnapper suddenly says only one of you can survive and he gives your parents the power to choose.Your parents both chose your older sister,your sister is always beautiful and loved by everyone.You despaired in tears.But suddenly the kidnapper hugged you and smirk

"Dont cry,my dear ~ They chose your sister, but I chose you."