In 2007, 16-year-old girl Qiao Qingyu and her family, tormented by rumors about her sister Qiao Baiyu's death, were forced to relocate from their small county town of Shunyun to the provincial capital of Huanzhou. In order to quickly restore their family's normal life, Qingyu, with the help of her classmate Ming Sheng, began searching for the true cause of her sister's death. As the truth gradually revealed, Qingyu was shocked by the injustice her sister Baiyu had endured and resolved to seek justice for her.