Spoiler
So she was always a bitch. There are multiple timelines caused by the evil God. Yenna was working with the evil God. In the first time line she killed Hart and Laura, but she lost, I can’t remember why. The evil God reverse the time, the second timeline was Astra’s first life. When the evil God reverse the timeline again, Yenna’s soul was too damaged, so the evil God needed a new vessel which was Astra. The third timeline was the novel that Hanelope read in her past life. The current one is the same as the third but the only difference is Hanelope is getting involved. After Astra was defeated and killed, the evil God needed to bring back Yenna, but Yenna’s soul was too damaged from all the time reverse (think of Penelope Eckhart from death is the only ending for the villainess, her soul was damaged from all the constant reborning and dying), so the evil God had taken the soul of the evil sister from the Hanelope’s life in modern Korea, and made her the new Yenna. She was also a bitch and was killed in the end.
Possible spoilers?
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Is she Yena?? It would make sense if shes the original saintess. She came from another world, after all?