Zhang Yi, a young folklorist, embarked on a perilous journey to explore the hidden corners of China, carrying the incomplete ancient scroll "Original Records of Youxu" that was passed down by his family. This ancient scroll is not a record, but a dangerous "key" that points to forty-two twisted "secret ruins" - horrific places that are deeply integrated with folklore due to ancient taboos, monstrous obsessions, or alien rifts. Under the Nuo surface in western Hunan, deep in the cellars of southern Shanxi, and in the shadow of the banyan trees in Lingnan, Zhang Yi encountered not only cannibalistic paper-cuts, immortal songs, and parasitic ancient mirrors, but also the deepest darkness of human nature. He must quell the folklore phenomenon caused by the imbalance of the ancient scrolls, collect the scattered pages, and piece together the shocking mystery of his own bloodline. However, the mysterious organization that covets the power of Youxu is always following him, and the resonance ability he uses to sense danger is quietly eroding himself, pulling him into the unknown abyss. Every time you pick up something, it is a sacrifice to the ruins, and it is also a dig towards the truth.