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What is good and what is evil in this world, Nanyuan Shenlong and Beiyuan Shenyu guard the mountains, rivers and earth. Each generation of them has survived for hundreds of thousands of years, watching the changes in the world, and then died at the last moment, passing the position to the next person in charge... And the next ones are born with a mission, but their fate is often not satisfactory. 'Xi'er, are you willing to believe me? ' 'I don't want to! '