Li Cu, an ordinary high school student, is suddenly attacked by a mysterious man who leaves a strange mark on his back. During treatment, he meets Dr. Liang Wan, who helps him uncover the man's identity with the assistance of Wang Meng. Upon returning to Liang Wan's home, they find Wu Xie waiting outside, urging Li Cu to join him on a journey to the desert. Once there, a series of baffling incidents unfold.