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People who have lived at the foot of a mountain on a tributary of the Songhua River for generations unexpectedly discovered that a depression outside the village was actually a homestead. Were there ever buildings there? Xu Er and his party, who took their friend Lu Qinyan back to his hometown for the New Year, accidentally encountered an unsolved case, which led to one unsolved mystery after another. What secrets are hidden in this small village surrounded by mountains and rivers? By chance, who will open it...