In ancient times, there were six realms, divided into heaven, humans, Shura, animals, hungry ghosts, and hell. Each three realms constituted one sect. Every eighty years, six chosen people descended into the world as descendants of the six realms. According to legend, gathering the six destined people could summon the greatest power in heaven and earth. However, due to the evolution of the times, only a handful of people in the world believe in the legend.