Fang Hongye, a scholar who writes about martial arts for a living, hears about the strange story of the butterfly murder in the jianghu, and in order to find out the truth, he comes to the place where the incident happened, the Shen family castle. Shen Qing, the master of the Shen family castle, invites all martial arts masters to solve the mystery of the butterfly murder. Soon after their arrival, Shen Qing is suddenly killed by a butterfly, and then others are killed one after another. After several rounds of investigation, Fang Hongye discovers that the butterfly murder was just a trick, and Shen Qing wanted the masters to kill each other in order to dominate the martial arts world. In the end, only Fang Hongye escapes from the Shen family castle. This movie shows a strange and eerie ancient world with rich and strong imagery.