Uncle Jiu, If You Need Something, Please Call Dad.

There was no "yin and yang barrier" in ancient times. The Nine Netherworlds of heaven, earth, humans and gods were originally one. Later, due to the war between immortals and gods, earth immortals and the Nine Netherworlds, the ancestors of China united with the local earthly immortals. Based on the Chinese dragon veins and Taoist magic as a guide, they set up the Chinese Pulse Protection Formation (not a three-realm barrier, only to protect the Chinese earth veins) to keep the Nine Netherworlds out of China. It did not seal the Three Realms. Thousands of years later, the Chinese Taoist tradition declined (the Maoshan hermitage and the Zhenyin family withered). The pulse protection array gradually weakened due to no one maintaining it. In addition, the earth veins in overseas areas were completely polluted by Yin evil spirits. The power of Yin evil spirits poured into China along the gaps in the spiritual energy of heaven and earth, triggering the The Yin Evil revived; and the human profit-seeking sect (Spirit Seizing Cult) arbitrarily invaded the Yin Ruins of China (the energy anchor of the Chinese Pulse Protection Array, which contains the dragon vein spiritual materials and Taoist techniques, not ancient tombs), further destroying the Pulse Protection Array, causing the Yin Evil to wreak havoc in China, and the era of great chaos began. The Sanqing Temple in Maoshan where Uncle Jiu is located is one of the Taoist inheritors of the Chinese Pulse Protection Formation. The jade plaque in the temple sensed that the Pulse Protection Formation was broken and the Chinese Earth Line was invaded. Uncle Jiu then took his disciples down the mountain - not to save the world, but because "the Pulse Protection Formation is the foundation of Maoshan Taoism and the Chinese Earth Line exists." "Only Maoshan can survive", this was his bottom line; and the General Administration of Defense of the Motherland had already noticed the anomaly and secretly studied the integration of magic and technology. Uncle Jiu's coming down from the mountain gave China the possibility of "traditional magic + modern defense" to resist the evil. The two hit it off and fought side by side.