In 2007, 16-year-old Qiao Qingyu and her family are tormented by rumors surrounding the death of her sister, Qiao Baiyu, forcing them to relocate from the small town of Shunyun to the provincial capital, Huanzhou. In order to quickly restore their family's normal life, Qingyu, with the help of her classmate Ming Sheng, sets out to uncover the truth behind her sister's death. During the investigation, Qingyu not only gains a new understanding of her sister and mother but also finds a new perspective on the world, healing herself and those around her in the process.