Major spoilersss
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I read that Libertia (OG) was actually the one who technically made Ariel the way she is, because she's actually her little sister but with a different soul. She had to save her little sis (which is the MC) from an evil mage dood in the family (main villain)-- so she transported the soul of her sister elsewhere so her lil sis could live peacefully.
In a way, you can even say that Ariel's body is actually the MC's, but nobody knew but Libertia.
So the "novel" & "Ariel" was Libertia's way of at least connecting with her lil sis and looking after her. To save her lil sis from dying again in the modern world, she returned her soul and put it in her own body because she (Libertia) was already dying because of her disease.
Libertia wanted to give "Ariel" a good and happy life so she purposely chose Ariel's soul preppy and "loveable" that's built in the imagine of her lil sis, hence why everyone ends up "liking" her and why Libertia was antagonizing her, so more people would be inclined to protect her.
Can someone explain what's so great about Ariel anyway??? The Prince loves her as though she's this most amazing angel but so far all I could tell is that she's dumb, cries and whines for people to save her that it hurts my brain. Just. Why????
On a side note, DAMN DANIEL.