After school, Tong Ling, Bai Jifan, and Yue Jin are left behind to clean the playground, only to stumble into a conflict in the Soul Realm and get swept into another world. There, they learn that the world is divided into three different planes: the Human Realm, the Soul Realm, and the Demon Realm.
The Grudge Stone shatters, and a fragment strikes Tong Ling, lodging itself inside her. Mu Zhe does everything he can to remove it, only to unexpectedly uncover the mystery of his own origins.
Bai Jifan wanders into the Demon Realm and is rescued by a fox demon when he finds himself in danger. He never expected to have such a deep connection with her, while Yue Jin mysteriously disappears, with no one knowing whether she is alive or dead.
After overcoming all kinds of hardships, they finally return to the Human Realm, only to find that everything has changed.