
If you dont mind being spoiled, initially Jieun was the only child of god but when Tia returned, she too became a child of god therefore in this timeline, they are both real. However, towards the end Jieun sacrifices her power which was proof of her status as child of god, leaving Tia as the sole child left. In the end, the prophecy is still met.

Spoiler
I think I read someone saying in their past life, when Tia died the prince realize that Tia was doing a great job in the palace. Bec from what they showed us in tia's past life she's actually been doing everything even the empress work even though she is just a 'queen'? (Or am I wrong). And I dunno if it's real but the spoiler said the prince was just being brainwash like comparing him to her and how great Tia is.. but when Tia died he realize everything and also I heard he committed suicide in the past life? Am not quiet sure been reading so many mangas and spoiler

Yes correct, I read it too somewhere saying prince had feelings for Aristia which I get this lifetime there’s some scenes showing some kind of interest but from past life the only scene was the scene when she was pregnant and miscarriage, he looked concerned about her but then Jieun got jealous of them being together so he let her alone....and that was a very sad scene.

correct even though she is the queen and not the empress but still she was doing all the empress work but I don't think that's the reason behind his feelings. Actually I do believe if he had feelings for her everything went wrong after she tried to kill him thinking she never loved him and she only aiming to be the empress so he was hurt with just the idea that she tried to kill him with her own hands....well these are just my input of the plot.
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They were correct that the prince in both timelines loved Tia but their relationship in the first timeline was so twisted and toxic. That plus the fact that they were manipulated by ahem..... destroyed both of them. Jieun in the new timeline is different now because she also remembers all that has happened in the first timeline. I would say she's very scheming now because she has many goals such as proving herself against Tia, going in between Tia and Ruve's blooming relationship and getting revenge against Ruve (who abandoned her at the end of the 1st timeline) and the evil eviiiiiiil duke hmp hmp that demon (๑•ㅁ•๑)✧
Anyway, here on out it gets very deadly and at one point, Tia becomes critical so Jieun who had realizations by that time decides to sacrifice her child of god power in order to save Tia. To be honest, I don't think she's evil nor is she kind. She just made really dumb decisions but she learned from her mistakes and tried her best to make amends.

Here ....someone already wrote a very nice spoiler for us
http://www.mangago.zone/home/mangatopic/5175109/

Here ....someone was very kind and wrote a very nice spoiler for us!!!
http://www.mangago.zone/home/mangatopic/5175109/
Yoo the high priest just called out the temple??!?!? How is he going to take the long pause and have people calling tia a fake?!? So is she the real one? Or both of them are the real one?