Three hours in front of the Xuanwu Gate, he traveled through time and became the mortal Li Shimin. He was surrounded by informants, and there was an original person in his mind who hated him - but he came from fourteen hundred years in the future.
Fighting against the prince in the court, defeating the coalition forces in Hulao, and retreating the Turks on the Wei River, he used wisdom beyond the times to overturn the deadlock and make all his opponents convinced of their defeat.
But when all the nations came to court and the prosperous age first came into being, he discovered that his biggest enemy was not his enemy - but the home that made him willing to stay forever.