How could twin sisters be such polar opposites? Kwon Shi Ah is the beautiful sister, gorgeous in every way and a member of the popular girl group known as Miracle Girls. Since she was in preschool, Shia has worked as a model and then a teen actress before becoming an idol. Her fraternal twin sister, Shi Yeon, is almost double the body size of Shi Ah and has always been ridiculed and bullied in school for her large frame.