I subconsciously turned my head with the woman in the white dress, checking the source of the screaming. It turned out to be the woman who was previously possessed by the one in white waking up, screaming continuously while staring dead at her.
Of course, she couldn't see me, as I was in a state of spirit ejection. Since I'm not a ghostly apparition, I didn't know how to show myself while in soul state to ordinary people. Perhaps it was a kind of ghost curse, or maybe it's something all ghosts can do.
There's another possibility for seeing ghosts who haven't made themselves visible: one's luck being too bad, leading their "three fires" to flicker unsteadily, or even to be nearly extinguished.
Clearly, there were only two reasons why the woman could see the one in white: either the latter had shown herself, or the former's luck was dreadfully bad, as indicated by the darkening of her Yintang point—an omen of impending blood disaster.