Xiao Duanshan traveled to the night of Xuanwu Gate in the early Tang Dynasty. He intended to save Li Shimin who was being surrounded and killed, but accidentally beheaded Li Jiancheng in the light of swords and blood. He was originally a modern agent with future military technology, but he was trapped in the torrent of history. Chu Jinyan, a secret agent of the former Sui Dynasty family who was hiding in the dark, knew that Xiao Duanshan was not from this world, so he secretly planned to use his hands to overthrow Li Tang's foundation. The two met under the blood-stained palace wall. One was a rebel and the other was an avenger. From suspicion to joining forces, they opened a rift in the gears of power. When the torch illuminated the Tai Chi Palace, Xiao Duanshan's blade no longer danced just for loyalty - Chu Jinyan's eyes reflected the burning image of the dynasty that he had ignited with his own hands.
