I'll read the novel but my theory for now is that the witch switched their souls bc either she was jealous of mc or needed to become queen for much more sinister plans. If they look identical, I also think they may actually be twins or related by blood in some way or another. The witch was either taken away or abandoned as a child for whatever reason, which is why she grew up poor, meanwhile her sister was able to grow up as a spoiled princess, leading to ugly feelings that motivated the soul-switcheroo.
I'll read the novel but my theory for now is that the witch switched their souls bc either she was jealous of mc or needed to become queen for much more sinister plans. If they look identical, I also think they may actually be twins or related by blood in some way or another. The witch was either taken away or abandoned as a child for whatever reason, which is why she grew up poor, meanwhile her sister was able to grow up as a spoiled princess, leading to ugly feelings that motivated the soul-switcheroo.