In the Tang Dynasty, Only a Fool Would Be the Emperor

An ordinary college student in the 21st century traveled across the Tang Dynasty due to drunkenness and became Li Shimin's third son, Li Ke. In order that his brother, the prince, who had been good to him since childhood, would no longer be exiled, and in order that he would no longer be falsely accused and strangled in the future. So he took the initiative to practice martial arts, got involved in the court, and helped Li Chengqian ascend to power. However, the style of painting gradually changed later on. Li Shimin was about to pass the throne to him, but Li Chengqian was giggling silly on the side... Note: The plot of this book does not move that fast, and the protagonist does not have a system or a cheat.