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The mysterious realm of magic is hidden in modern cities, and the Xuanmen family secretly maintains the balance of yin and yang. Ruan Xiaotao, an ordinary female college student, accidentally acquired an "unlucky constitution" and was involved in a conspiracy that spanned twenty years. At the same time, she met Lu Wuyou, a math genius with a cold appearance. The two were forced to team up to solve the mystery due to a dispute in their natal charts.