The prehistoric world has been invaded by "foreign aliens" for 30,000 years. The human race has been reduced to slavery and blood food. Civilization has been broken, and only the remaining tribes are surviving. The alien races are divided into seven major tribes, including the "Blood Demon Clan", the "Bone Demon Clan" and the "Shadow Clan", each with their own strange abilities and ruling the world. Lin Xuan, a 25-year-old graduate student in the Department of Modern History, accidentally traveled to the prehistoric era and awakened to the "Chinese Heroic Spirit Summoning System".
