Looks like ihwa's sister
that can't be, ihwa's sister got ponytail and a weapon that has blade blade on top and below, and currently being possessed by an ancient monster
My theory (I just binge read in 2 days so I may not have fully understood stuff yet cause idk how the feelings were caught ngl) I think the shadow woman takes the form of those who have “scarred him”
Because originally she had a crown I believe
wait, was that woman Shadow of his, ihwa??