The Sickly Sister and the Fake Brother

I am an ordinary high school student, but I have a good friend from a prominent family. We are very different in appearance. He is handsome, elegant, and lovable. I am average in appearance, introverted and timid, and no one cares about me. If we want to talk about similarities, our voices seem to be very similar. Of course, there are subtle differences, but to the extent that it is difficult for strangers to distinguish. One day, a good brother's family had an accident (such as a plane accident), and only his sister survived. The sister was seriously injured in the accident, her legs were paralyzed, she was blind, and her body was weak. She had no idea about the death of her favorite parents and brother, and the people around her kept silent because they were worried about her mood. The story happened when "I" went to the hospital with a heavy heart after attending my friend's funeral to visit my sister who was lying on the bed in the recovery stage after just having surgery.