In the future, technological civilization has advanced greatly. Humanity becomes aware of an existence watching them from a third-person perspective. To verify whether the world is caught in a cycle of reincarnation, they develop a simulation algorithm codenamed Red Specter.
In the seventeenth year of the Republic, Zhang Geyang gradually discovers that something is wrong with this world. Certain details don't match his memories, and certain people and events seem to be heading toward predetermined endings. Red Specter may be the most important "anchor" in the simulation System.