After reading so many film reviews, no one mentioned the pattern found by the father and son. Based on the lack of understanding of the meaning of the pattern, I personally guess that there are two possibilities.
One is that the female corpse is really a witch, and the tattoo under her skin is the result of her practice of witchcraft, similar to the curse mark in Hokage, swallowing the spell before death starts the ritual of revenge.
The second is that the female corpse was framed as a witch, and the tattoos under her skin were stabbed by her abuse. It may have been pierced deep into the skin, but the epidermis recovered after revenge. You know, at that time, with fear and hatred for witches, it made sense to stab a seal and then let her swallow it.
I feel that the key to the identity of the female corpse is whether this is a spell or a seal. I look forward to the great god revealing the secret.
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