In ancient times, the world was in chaos, and humans, ghosts, demons, immortals, and demons lived on the same land. Later, in order to distinguish, the leaders of the five parties negotiated and respected the fairy world, and the other four parties each chose the earth world to live in: the ghost world chose to live underground because it did not like sunlight and did not like disturbance; the human world chose to live on the ground because it was good at farming and liked the four directions; while the demon world and the demon world chose mountains, rivers and woods to live in for the convenience of practice. Then, the leaders of the five parties made a covenant not to invade each other.
Over the past ten thousand years, the leaders of all parties have changed from generation to generation, and the covenant has been gradually forgotten by everyone. The demon world is full of ambitions, and the demon world has become dominated by the demon world at some point. They were dissatisfied with being respected by the fairy world, so they launched a war and attacked the fairy world. The war lasted for a hundred years. In the end, the master of the fairy world used blood as a guide and used the forbidden magic of the fairy world: blood prison to suppress the devil. Therefore, both the immortal and demonic realms elected new leaders at the same time, and the demonic realm still followed the demonic realm.
Because the past events were too tragic, the new Lord of the Immortal Realm did not want any more disputes, so he found a mountain in the human world, opened a mountain gate, and changed the Immortal Realm to Xuanyuan. From then on, he no longer respected anyone. However, the two parties still made a covenant and swore an oath in blood that the demon world would never invade the human and immortal worlds again. Since then, only three of the original five directions have remained: the demon world, the human world, and the ghost world. The three-party peace situation lasted for a thousand years, until that day...