Lie Down and Mess with the Tang Dynasty

Li Xianyu is a salty fish in the 21st century. His biggest dream is to make money while lying down. When he woke up, he was transformed into the son of the general manager of Dingzhou who was exterminated on the night of the Xuanwu Gate Incident. Seeing that he was about to be silenced, he suddenly thought and hugged Li Shimin's thigh: "Does His Majesty's promise last year still count?" Li Shimin was confused: "I only ascended the throne yesterday, where did last year come from?" Li Xianyu said seriously: "The me of yesterday is not the me of today; Your Majesty is yesterday. , He is not your Majesty today. But promises are also effective in traveling through time and space!" From then on, this "son of an old friend" with unknown origins began his life in the Tang Dynasty - when the emperor summoned him, he pretended to be sick; when the princess fell in love, he pretended to be stupid; when the powerful officials tried to win over him, he pretended to be dead. Unexpectedly, the more I want to keep a low profile, the more I will be pushed to the forefront. When the Turkic army pressed on the border and the civil and military officials of the Manchu Dynasty were helpless, everyone looked at the back of the figure who was fishing in the imperial garden...