Su Zhen's paternal grandfather slept soundly during the day when, suddenly, a head—the size of a large earthen jar—erupted from the floorboards beneath his bed, perpetually turning. The old gentleman, shocked into illness, soon passed away.

Later, the old gentleman’s younger brother engaged in illicit affairs with a gui, inviting his own demise. Could the sight of the severed head rolling on the ground have been a prophecy?