Alternate history + parallel timeline
After Emperor Taizong Li Shimin died, his soul wandered a thousand years into the future. He witnessed the nation's humiliation with his own eyes and was furious at its failure to live up to its potential. Then he suddenly woke with a start: he had become Emperor Xuanzong of Tang, ruler of the Kaiyuan Prosperity!
Just as An Lushan raised his troops in Fanyang, Taizong, seated on the imperial throne, glared in fury. "I conquered this realm myself. How can I let barbarians run amok in it?"
At court the next day, all the officials watched in shock as "Xuanzong" drew the Son of Heaven's sword and kicked Yang Guozhong to the ground. "Guards! Muster my Black Armored Army! I will lead the expedition myself!"
