For seven nights in a row, Chen Mo dreams of an old man who calls himself his "ancestor." The sound of copper coins in the dreams overlaps with reality. When he wakes, he finds fine sand from the ancestral hall's cellar on his body, and an app called "Ancestor Worship" has mysteriously appeared on his phone.
His father tells him that the family grave has collapsed, hinting that the family may be hiding a secret. Chen Mo begins investigating the connection between his family's history and the copper coins.
