
She acted like a useless moron in the 1st timeline. She acts like this now because she is salty that after the prince murdered Tia she was left to do her own work and her incompetence was evident since Tia was no longer there to cover for her lazy dumb ass. That everyone who adored her including the stupid prince turned on her.
Rather than accept responsibility she blames Tia for no longer being arranged to be used as an emotional punch bag by the prince and to do all the heavy lifting work wise. Seriously, her and the prince deserved each other.
Tia deserved better.

She acted like a useless moron in the 1st timeline. She acts like this now because she is salty that after the prince murdered Tia she was left to do her own work and her incompetence was evident since Tia was no longer there to cover for her lazy dumb ass. That everyone who adored her including the stupid prince turned on her.
Rather than accept responsibility she blames Tia for no longer being *around to be used as an emotional punch bag by the prince and to do all the heavy lifting work wise. Seriously, her and the prince deserved each other.
Tia deserved better.

True. Following is not 100% sure that it's a legit poiler or maybe this is wrong but i saw this somewhere.
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I thought the reason why Jieun is acting like a b**ch is of course because she's doing all the work of the empress and because she hates Ruve but mainly because of Ruve? Because when duke zena was about to attack the palace ruve escaped the palace thinking that if he isn't there maybe they would be safe while in jieun's pov it looks like ruve abandoned her and their child and after she got back into the world of tia she was determined to make Ruve and Duke zena's life miserable. That's why she went to duke zena's faction to spy him and while on it she kinda planned to use duke zena to make Ruve's life miserable.
But then turns out Ruve was in love with Tia and since she already has some hatred for Tia but not that much she planned to make Ruve miserable by making Tia miserable too. If I were to distribute Jieun's hatred for the 3 of them it would be like this: 47% Duke zena 47% ruve 6% tia
Please correft me if I'm wrong since maybe this is all fake spoilers or smth.
I’ve been shipping her with Carsein since they Met ! And I still want them to be together dammit ! & so I’m guessing Juein was always that evil she was just pretending the first time ┑( ̄Д  ̄)┍ anyways can’t stand her , maybe if she acted soft like before she would have us wanting a happy ending for her but F her ! Also lowkey wanted this to be a harem and let her have the cake and eat it tooo , cause I loved me some toxic Allendis lol but ahh I read all this in 4 days and caught up