Simulator: Transform into a Dragon from a Green Snake

At the end of the Immortal Age, in the Human Era, the human race suppressed all races. In times of crisis, Gu Yuchuan transformed into a green snake and came to the world with a dragon simulator. Being of humble origin, I began to simulate. My cultivation level is low, so I continue to simulate. There are many enemies, but I still simulate. When the Qiankun Dynasty brought thousands of soldiers and horses to destroy the demon clan. Gu Yuchuan has become the only divine dragon in the world of immortality. He came to control the water, and the water of the four seas blocked thousands of troops. Today, I am the Demon King. Anyone who offends my demon clan will be killed!