
the prince had always loved her, but the poison manipulate his thoughs, so when the mc died Jieun kinda found out, the stress made her lose the baby, the prince just regret all he did with mc and jieun was criticized by all the empire and have no one in her side, like u guess, all this people compared her with mc, so she started to hate aristia and blame her for all this
hypocrite, because mc didn't choose to die ( ̄へ ̄)

Don't worry guys I read all through this and she gets what she deserves.
Spoiler.
In the end we find out she could have gone home and never have to come there and go to back to her friends and family . But nope she felt like the FL was at fault and it was all her fault what happened to her so she chose to go back for Revenge And lost.
I wonder what happend to jieun after she died. I think she suffered about rumour or something about comparing the MC and her or something...it's just a hunch tho...