In the Tang Dynasty, a series of murders occurred in a small border town. People saw a mysterious army transporting treasures at night. Wu Zetian (played by Kristy Yang) ordered Di Renjie (played by Luo Liqun) to investigate the case. Di Renjie learned that people who had seen the mysterious army died one after another, and even the corpses at the scene showed a "sand-like" phenomenon. Li Shaoxia, who came to look for his relatives, and Di Renjie, who was in trouble in investigating the case, worked together to decipher the mystery. With the joint efforts of the two, a conspiracy to subvert the Tang Dynasty gradually surfaced...