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500 years ago, a mysterious force of unknown origin appeared in a vision of heaven and earth, which harmed the common people and was extremely hidden. Hiding next to the place where people live, it erodes people's consciousness without being noticed, until they die. Chu Yunxiang and Mu Gebi, a Taoist couple with lofty ideals, separated to save the common people. They traveled around the world in the form of souls and quelled the chaos, moving from the south to the north, starting from the outside and gradually moving inward. For various reasons, they lost the memory of their love, but because of the Taoist couple contract mark on their wrists, they could know each other's existence, but they could not know where the other was. They only knew that the other party had the same lofty ambitions as themselves, to save the people and bless the world. The origin of that mysterious power and their lost memories will be revealed when they meet. But then, they must separate and the contract will be untied. They will become the protectors of the south and the north. They can become confidants, friends, and relatives, but they cannot become Taoist companions alone. Otherwise, it will definitely bring disaster to the world. In the end, there is no destiny...