Strange Folklore: I Rely on My Grandfather's Notes to Calm Everyone

In modern society, ancient folk customs have not disappeared, but are hidden in the corners of daily life (such as sacrificial rituals in remote mountain villages, funeral customs in old cities, and taboos in traditional festivals). Behind these folk customs are bound the corresponding strange existences. Once someone breaks the taboo, they will be entangled in the strange. The protagonist's grandfather is a folk "observant of secular customs" and leaves behind a notebook that records the weird folk customs of various places, how to solve them, and tutorials on making homemade magic weapons. After inheriting the notes, the protagonist is forced to embark on the road of dealing with weird folk customs. At the same time, he discovers that the cause of his grandfather's death was not an accident, but was related to the "Broken Customs Society", an organization that specializes in using weird folk customs to harm people.