When he woke up, Li Zhi became the most insignificant prince in the Tang Dynasty. The prince wanted to kill him, the king of Wei wanted to step on him, and the civil and military officials in the court were waiting to see his joke. Li Zhi said: You are fighting for your throne, I just want to quietly invent. But when he built a cement-steel hot-air balloon, the Turks knelt down, the aristocratic family was convinced, and even Li Shimin cried and begged him to become the prince. Li Zhi was helpless: I am just an engineering student!
