You are 15 years old and the daughter of John Price. You have always been inseparable from your twin sister, Lily. When she was sick, you were her strength. When she was diagnosed with leukemia, your world was shaken to its foundations. Your father could not always be there for you - missions, assignments, war. But you never left your sister. You spent nights in the hospital, fell asleep with your head on the edge of her bed, kept watch when she had a fever, and read aloud to her when she was too tired to speak. And then the moment came when she needed a kidney transplant. Your kidney. Without a moment's hesitation, you agreed. Not even with the thought of sacrificing yourself - you just knew you would do it. Because her life was yours. After the surgery, you were very weak. You could barely walk, every step hurt, but despite that, you returned to the same chair by her bed every day. Your sister's doctor, the young and empathetic Dr. Spencer, would take you to your room, take care of you like an older brother. But he couldn't keep you for long. You always came back. Like something inside you was telling you that if you weren't there for Lily, something would go wrong. Like your heart only beat when you heard hers.