Nine heavens, a total of nine layers, respectively, one middle heaven, two Xian heaven, three from the sky, four more days, five the sky, six days, seven salty days, eight Shen days, nine into the sky.

The Nine Heavens in charge of the Nether Realm are divided into four forces, the three forces of the Immortal Palace, the Demon Realm, and the Demon Hell contain each other, as well as the neutral Mingling Mountain.

The two forces of the Immortal Palace and the Demon Realm appeared almost at the same time, and the well water of the two did not interfere with the river water, and they had been safe for tens of thousands of years. Tens of thousands of years later, some of those who were punished by the Emperor of Heaven and degraded to immortals had evil thoughts, and their strength continued to increase in secret, and finally established the Demon Prison, and the Nine Heavens gradually formed a three-legged situation of the three forces of the Immortal Palace, the Demon Realm, and the Demon Prison. Asgard, Demon Hell Due to historical problems, border friction continues, and wars occur from time to time, but the scale is smaller, and the war has never extended to the interior, and both forces have turned a blind eye to this.

As for Mingling Mountain, in ancient times, the best physician of the Nine Heavens, Luan Luo, could not bear the intrigue of the three forces, so he retreated to Mingling Mountain, creating a world of his own.

Jiuchengtian is divided equally among the four forces, and their headquarters are all set up in Jiuchengtian. One Heaven is the Western Elysium, that is, the place where the Buddhas live. Erxian Heaven is controlled by the Ten Halls of the Underworld, and it is a place where souls gather and control the cycle of life and death.

The fairy palace is in charge of the three heavens, the four watch heavens, the highest power is the emperor of heaven, the class system is strict, there are eight gods to protect it, and the old demon lord is estranged.

The forces of the Demon Hell belong to the Five Heavens and the Six Heavens, which are controlled by the Demon God, and the twenty-four Demon Kings guard the safety of the Demon Prison, and their strength is extremely strong. The people in the demon prison are very fond of extravagance, and they are also murderous and chaotic.

The demon world is in charge of the seven salty heavens, the eight Shen heavens, with the lord of the demon world as the respect, there are four divine beasts guarding the four directions, and the twelve protectors are in charge of large and small affairs, the demon world has no strict system, orderly in chaos, free and arbitrary.

The sphere of influence to which Mingling Mountain belongs is only Mingling Mountain and its affiliated mountain ranges, which are controlled by the God of Medicine, and the three races of immortals, demons, and demons live together, without obvious racial discrimination, except for murder, robbery, theft, private fighting, etc., there is no other control. Although Mingling Mountain is relatively small, it gathers most of the doctors of the Nine Heavens, and the other three forces do not dare to take any targeted action against Mingling Mountain.

Yun Hanyan, the lord of the demon world, walks between good and evil, is extremely protective of his shortcomings, only seeks his own heart in doing things, does not ask whether he is right or wrong, and does not want to be forced by others. The heart has seven tricks, eight sides are exquisite, and he is extremely tactful, knowing the world but not the world, but he is decisive in killing and ruthless. Born with a pair of Nine Shadow Heavy Pupils, these Nine Shadow Heavy Pupils can observe the past, the future, the four directions of heaven and earth, can break all obstacles, and have a weakening effect on illusions and evil things, and the combat effectiveness is extremely strong.

Yun Hanyan was born with a frontal flower, and the flower name is the ghost poppy. She loves a fluttering white dress alone, a plain white dress with a slim fairy spirit but extremely charming, but the two contradictory temperaments do not seem abrupt in her. Known as "the first beauty of the Nine Heavens", her hands are like soft wattles, her skin is like clotted fat, her collar is like a grub, her teeth are like a rhinoceros, her eyebrows are like green feathers, her teeth are like shellfish, her waist is like a bundle, her ice muscles and jade bones, her body is tall, her skin is fair, and her black hair is like a waterfall.

Yun Hanyan's medical skills don't know where he came from, and a doctor with a great reputation in the Nine Heavens once said: "Yun Hanyan's medical skills, except for Mo Ruoqing, the medicine god who has been in retreat for several years, can be called the first person in the Nine Heavens Medical Skills." It can be seen that his medical skills are brilliant.

The demon world is not only unhappy with the fairy palace in the past ten thousand years, since the death of the old demon lord, the demon world and the fairy palace have been friction from time to time, and the old demon lord was victimized by the treacherous tricks of the emperor and died. Therefore, the demon world has been planning how to invade the Asgard Palace since then. But there was a spy among the internal executives of the demon world, and the news of Yun Hanyan's plan to fight against the fairy palace was leaked, and the emperor of the fairy palace was extremely angry when he found out, and sent people to lead troops to recruit the demon world.