
I can hate her to my heart's content, she's not possessed, nor is she brainwashed, she's just greedy, ignorant, and shallow.
She's already crown princess and she has a man devoted to her, devoted enough to pardon her mistakes and apologize to her instead of blaming her, he is still trying to guide her to do the right thing and has not abandoned her despite her many shortcomings, yet in her greed and ignorance, she is still deflecting and now wants to go to the other option.
He saw that Helios was miserable from being with Diana, and unhappy that he had to constantly try to correct/excuse her mistakes and he told him not to divorce her and that he wants her to remain as his daughter in law no matter what.
Diana had many years to settle into her role as crown princess, she had tutors, royal entourage, and even Harmonia to guide her and educate her to become a suitable crown princess, yet she isolated herself from them and chose to not heed their advice, and instead of wanting to elevate the living conditions of the common people, she wanted them to remain in poverty not even able to afford soap.
But the moment the emperor sees that Diana is hesitant towards Helios he tells her "nothing is worth sacrificing for the things you think you want" and grants her a divorce!!! Why in the world is this random girl's wants more important than your son's? Why is her misery more moving than the misery of your own flesh and blood??
I am baffled!
This I could never understand either but hey, this kinda shit happens in real life too