Huo Xiaotong mysteriously disappeared after passing through the "Ghost Triangle" on campus. Cao Kun, who had a crush on her, was involved in a series of strange events in order to find the truth. The red leather shoes in the archives room, the acrostic poems in Huo Xiaotong's archives, and the mysterious disappearance of Ai Qing, the author of the school magazine, are intertwined with clues. Cao Kun, his friend Jiang Shuai and others investigated the case and found that the disappearance was related to Zhang Fei, a boy who died three years ago. As the Ghost Festival approaches, Cao Kun and Zhang Fei engage in a life-and-death contest with puzzles in the "Ghost Triangle". In the end, he not only reveals the truth, but also rescues Huo Xiaotong and Ai Qing, breaking the curse of the "Ghost Triangle".
