I'm good to slay the dragon in my dreams!

In the Journey to the West, it is described that during the Tang Zhenguan period, Yuan Shoucheng and the Dragon King of Jinghe bet on the specific time and details of the rain, and the result was that the holy will of the Jade Emperor was the same as yuan Shoucheng said.
In order to win, the Jinghe Dragon King changed the time and amount of rain without authorization, which was a violation of the Heavenly Rule. When the Jade Emperor learned that the Jinghe Dragon King had violated the Heavenly Rules, he was furious, so he asked the "human Cao Official" Wei Zheng to behead the Jinghe Dragon King.
After the Dragon King of Jinghe knew, he quickly pleaded with Tang Taizong Li Shimin and asked Li Shimin not to let Wei Zheng kill him. Li Shimin saw that the Jinghe Dragon King was very pitiful, so he agreed.
On the day when Wei Zheng killed the Dragon King of Jinghe, Li Shimin deliberately asked Wei Zheng to play chess and dragged Wei Zheng to prevent him from leaving. Wei Zheng was also very "honest" and accompanied Li Shimin to play chess.
At three o'clock in the afternoon, Wei Zheng snoozed and slept peacefully. In fact, Wei Zheng was not really asleep, but out of his soul, he beheaded the Jinghe Dragon King in his dream, which is the story of "Wei Zheng's Dream of Slaying the Dragon King".
Wei Zheng was just a prisoner, and the Jinghe Dragon King was a god, how could he dare to kill the Dragon King? In fact, this is related to Wei Zheng's true identity.
Wei Zheng was a famous advisor in Chinese history, the first "bar essence" of the Tang Dynasty, who always liked to raise the bar with Li Shimin when there was nothing to do, and Li Shimin was dumbfounded.
Wei Zheng scolded Li Shimin, and Li Shimin also said to Wei Zheng with a smiling face: "Good scolding, continue to scold!" Of course, Wei Zheng would not be polite and continued to scold Li Shimin.
Wei Zheng dared to scold Li Shimin, but others did not dare to scold, which is not only related to Li Shimin's humble heart and good at receiving advice, the most important thing is Wei Zheng's identity. Wei Zheng's identity was many, the most important of which was the "Imperial Division".
As the name suggests, the imperial master is the teacher of the emperor, not only teaching the emperor cultural knowledge, but also assisting the emperor in handling national affairs. Being an imperial teacher is the highest ideal of the ancient literati, and if anyone can be the emperor's teacher, it is absolutely very powerful.
The social status of the ancient Confucian literati was very high, coupled with the influence of the idea of respecting the teacher and valuing the Tao, the imperial master was absolutely respected and worshipped by the emperor.
In ancient times, there were only two kinds of people who could teach the emperor, the first was the emperor's mother, and the second was the emperor's teacher, whose main job was to educate the emperor, point out the emperor's mistakes, let the emperor correct them, and make the emperor an outstanding emperor.
The ancient emperor claimed to be the true Dragon Heavenly Son, so the ancients used the fact that Wei Zheng killed the Dragon King to metaphorically that the imperial master could correct the emperor's mistakes and educate the emperor's virtues, so as to highlight the identity of the imperial master.
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References: Journey to the West, New Book of Tang, etc