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My father has been missing for twenty years, leaving behind a Hakka earth building and a name that no one dares to mention. Lin Chaowen, a graduate student in folklore, returned to his hometown in the name of fieldwork, but found a bone that should not exist in a crack in the century-old rammed earth wall of Chengde Building. The coffin rings for seven nights, the children lose their souls when they scream, and the drum beats of knocking on the coffin are heard from the ground on the day of the funeral - all strange things point to a taboo that has been sealed by the three major families: the living soil method. Walls are built by people. And the father disappeared just because he came into contact with this secret. This time, he wants to invite the people in the wall to come out one by one. ...