"If it really is Yue Na, and she only became a Vengeful Ghost to take revenge a year after her death, then this is complicated."
Chen Guokun seemed to be sorting through his thoughts, while also explaining them to Chen Miao.
"Normally, Ghosts form in the period immediately after a person dies. Most form within the first seven days. After that, the conditions become much stricter."
"As far as I know, there are only a handful of ways a soul could survive for a year after death."
"First, Yue Na had no resentment when she died, and her lingering obsession eventually attached itself to some object, turning into a Polluted Object."
"Second, after Yue Na died, she was buried in some special feng shui formation. The formation suppressed her, or trapped the Vengeful Ghost she became."
"Third, someone refined Yue Na's soul after her death and made her serve them."
"Which could it be?"
Chen Guokun murmured to himself.
Neither Chen Miao nor Tong Yu interrupted him.
"The first is impossible. Once a Polluted Object forms, it's essentially an entirely different species. Even if someone it hated in life uses it, it won't turn back into a Vengeful Ghost because of that."
"The second and third are both quite likely, but I'm leaning toward the second."
"The people Yue Na killed were all indirectly responsible for her death. If someone were controlling her, her master probably wouldn't be interested in helping her take revenge."
"More importantly, how would her master know who Yue Na resented?"
"So the third possibility doesn't fit."
"As for the second, I think it's the most likely. Perhaps Yue Na was trapped in a feng shui formation after she died and remained there until recently. Something damaged the formation, allowing her to escape."
"That would explain