During an ordinary midday nap between classes, sophomore college student An Zhixia wakes up to the startling discovery that no one around her remembers her boyfriend, Pei Yusen. Returning home, she finds that all the items he gave her have vanished, and there is no longer any information about him anywhere in the world. Confirming that she has no mental illness whatsoever, she investigates and discovers many strange things about her mother and her school's head teacher. With the help of her classmate Bai Siyan, she gradually uncovers the truth.