Su Yunjin, a single mother, has worked tirelessly for sixteen years to raise her daughter. After taking her daughter to register at the branch campus of Jiangcheng No. 1 High School, both her daughter and the entire school mysteriously disappear without a trace. When she reports the incident to the police, they claim that no such branch campus exists. Her desperate attempts to find her daughter cause a public disturbance, and she is sent to a psychiatric hospital, where she is killed by a falling flowerpot. Reborn on the very day of her daughter's registration, she is determined to protect her daughter and uncover the truth behind the school's disappearance.