Huo Xiaotong mysteriously disappears after passing through the campus's "Ghost Triangle." Cao Kun, who has a secret crush on her, sets out to uncover the truth and becomes caught up in a series of bizarre events. A pair of red shoes in the archives, an acrostic poem hidden in Huo Xiaotong's file, and the strange disappearance of campus journal author Ai Qing: the clues intertwine. Cao Kun and his friends, including Jiang Shuai, investigate step by step and discover that the disappearances are connected to Zhang Fei, a boy who died three years earlier. As Ghost Festival approaches, Cao Kun faces Zhang Fei in a deadly battle of riddles at the "Ghost Triangle." In the end, he not only uncovers the truth and rescues Huo Xiaotong and Ai Qing, but also breaks the curse of the "Ghost Triangle."
