What did the Dragon King of Journey to the West commit and why did he break the dogma?

The Dragon King of Jinghe changed the rainfall time and rainfall privately, and was sentenced to death by the Jade Emperor for violating the dogma.

There is a fortune teller named Yuan Shoucheng. He told the fisherman that as long as he was given a golden carp every day, he could reveal the secret and tell everyone where to catch fish after getting off the net. As he said, fishermen caught a lot of fish when they got off the net, so there were fewer and fewer fish in Jinghe River. King Jinghe was very angry, so he became a human being and came to the mortal world to find a fortune teller theory.

After meeting King Jinghe, the fortune teller made a bet on the time and amount of rain the next day. Unexpectedly, when the Jade Emperor's imperial edict arrived, it was consistent with the rainfall time and rainfall mentioned by fortune teller Yuan Shoucheng.

Jinghe Dragon King is a water god. He felt humiliated when he lost. So he tampered with the rain the next day and changed the time and amount of rain. He won the bet, but after gambling in heaven, he was sentenced to death by the Jade Emperor for violating heaven.

There is a folk expert named Yuan Tiangang. When the Dragon King went to ask him for help, he knew that the official responsible for executing the death penalty was Wei Zhi. After some efforts, Yuan Tiangang advised the Dragon King to ask Li Shimin, the then emperor of the Tang Dynasty. If Li Shimin is willing to help stall Wei Zhi and Wei Zhi misses the execution, the dragon king's life can be saved temporarily.

Li Shimin, Emperor Taizong, deliberately sought Wei Zhi to play chess to delay the time. However, Wei Zhi, who was good at planning, saw through the original intention of Emperor Taizong. He slept while playing chess and killed the dragon king in his sleep.

After his death, his soul has been rectifying Li Shimin. Finally, he took Li Shimin's soul to fight against the nether world. The nether world favors Li Shimin and releases him to the sun. King Jinghe's soul was forced into reincarnation by the ghost.

Extended data:

In the westward journey world, the so-called Dragon King only introduced some Buddhist views. Because in the earliest Indian Buddhism, dragons were compared to snakes. There is a bodhisattva who eats more than 100 snake kings a day, also known as the Dragon King.

Therefore, the dragon here is not a totem dragon. They guard the four seas, but they are just ordinary managers, just like the land gods. Therefore, it is okay for a particularly powerful mortal to kill a snake. In the westward journey, not only the Dragon King was in a low position, but also the Jade Emperor didn't trust them.