C25 Don't Ask Me What I Shouldn't Know
Actually, there's no need to clarify that Hanged Ghost is useless in this matter. I can completely freeze it with just a Glyph and pose no threat at all.
However, considering that Aegon had killed himself and that he could not report to the Underworld, Gu Chen mercifully allowed him to stay here until the day he could be reborn. With his help, Ajen even retracted his ghost aura