The protagonist Lin Yuan is not a time traveler from scratch, but Emperor Xuan who has reached the top in another world. When he was going through the tribulation, he was backlashed by the mysterious power because he had a glimpse of the "truth of heaven". His body was completely destroyed, and his soul accidentally fell back to the earth with thin spiritual energy. Here, he is no longer a simple immortal cultivator, but has become a "national strategic weapon" for the entire China to fight against unknown threats.
