Jiang Yunchun, a 12-year-old boy, has one worry: his sister Feng, who is 1 year younger than him. "He's obviously a brother, but he's shorter than his sister. That's okay. But, he's obviously a brother and sister, so why does my sister always like to hit me?" Every morning, my sister comes to wake her brother up. This should be a happy thing. However, my sister especially likes to beat her brother, almost always violently, and then the real nightmare begins...