Another one was the ancient corpse of the female cultivator in the Qiankun Ring. The corpse appeared lifelike and was extremely heavy. It was found in the sacred place where Yuan Lao Mountain had fallen. According to estimations, this ancient corpse had existed for at least tens of thousands of years.
However, the black bead was not interested in objects that had not entered the Sea of Consciousness. Han Yi had also inspected his Divine Soul and the black bead afterward, and found nothing unusual.
So.
The most likely possibility was the ancient corpse of the female cultivator.
When he was at Tanggu Mountain Range, Han Yi didn't suspect himself and thus didn't make these associations. But at this moment, as he was passing through Yuan Lao Mountain, he suddenly realized the possibility.