A lonely shadow on a deserted island, a lingering fire in the wilderness, a modern man thought he had traveled to an unknown world. With knowledge and wisdom, he led the primitive tribes to reclaim wasteland, conquer famine, establish order, and the dawn of civilization emerged. But when the truth is revealed, he realizes that this is not time travel - the earth has been destroyed long ago, and the shadow of aliens is quietly approaching. The fate of mankind will be rewritten by him...