At eighteen years old, Jiang Xiaoyan stands alone in a white dress every late night at the Nanqing Old Street bus stop. She tells Jiang Li, the only person who can see her, that she will die when dawn breaks and be reborn after dark. She is a zombie forgotten by the world, with extremely low presence, and anyone who sees her will immediately forget her. Out of curiosity and pity, Jiang Li becomes the first person to remember her. He gradually learns that Jiang Xiaoyan was not born this way—she voluntarily discarded her own heart to escape unbearable pain, at the cost of losing her emotions and awaiting death day after day. Jiang Li resolves to help her retrieve her heart.