As for asking what's special about the little ghost and why it can stay clear-headed, actually Zhang Yanhang felt that the little ghost did not stay clear-headed at all, because Zhang Yanhang suspected that the little ghost might have been an idiot before death, which led to retaining only some eating instincts after death.
And precisely because only some instincts exist, it might be the main reason that it can stay 'clear-headed'.
And if you want to know why Zhang Yanhang judged it to be an idiot, let's just say, the appearance of the little ghost was somewhat abstract, giving people an abnormal feeling at first sight, quite peculiar.
"So, the problem arises, what kind of incredible thing did this idiot little ghost do before death to perish along with family, creating this kind of three-in-one fused ghost?"
For this question, Zhang Yanhang found it hard to imagine, as normal people can never understand the world of lunatics.
