Mo Xining and her mother were in a car accident, and her mother died. Xining lost all her memories and moved to a new city with her father to start a new home. Xining and Ji Xialin are sisters from a single-parent combination. Luo Heng's best friend Lu Li is Xia Lin's boyfriend. He is also the monitor of tide Ning's class. He seemed to know tide Ning the first time he met her...