Snow Falls on the Tang Dynasty

Modern young man Chu Fang accidentally came to the Tang Dynasty. Before he could take a good look at this era, he ran into the Anshi Rebellion head-on. The prosperous age has turned into ashes in an instant, the lives of the people are like grass and grass, and the iron hoof is about to submerge this former invincible empire. Facing this war that has affected the entire history of China, where will he go?