In the fifteenth year of Tianbao, the rebels came to the city. The thief Li San sneaked into the prime minister's house, but stole a strange manuscript - the lines in the text actually predicted the "Emperor's Hunt to the West" three days later. When Chang'an fell into a sea of fire, he held not only words, but also the truth deliberately buried by history. In troubled times, one thief's decision may change the fate of the entire dynasty.