Emperor Ming of Han gave Ban Chao, a descendant of a historian, a bronze swallow talisman and sent him to the Western Regions to find the dharma of immortality and the golden Buddha in his dream. Ban Chao went to search for the masters hidden in the capital, including the descendants of Mohists, the descendants of thieves, and the poison masters of Yelang. In addition to fulfilling the emperor's wish, he also wanted to find the origin of the historian and the murderer who framed his father.