I wonder who she really is and what’s her identity.. like who are her parents
MAJOR SPOILERS
they aren't siblings, no no but in the past the ml drowned as a child and was saved by non other than our fml (who was a mermaid thus we always see snippets of her being compared to one). Won't give all the details so that you have something to look forward to but just a few more details is that in return for the fml to be human she had forgotten all about being a mermaid and the ml.
There is in fact a novel.
You can google the link for it.
To answer your question, yes she did choose to become human since the ml wasn't like that back then. They made a promise with each other. Her other sisters tried to warn her off of becoming human but alas. The young ml back then wasn't like the trash he was.








I think in her past life he loved her, but just didn’t know how to express it. Also mmm I think his wife and the consort(kings side piece) is poisoning the queen. Remember she wanted those tea leaves from his wife.
In her past life, she was a pushover, nobody like pushovers and even less Esteban.
I know he didn't like her AT ALL. Also, he did absolutely nothing when she was in danger from his wife
I think so too for both. But I think perhaps he didn't truly know that he cared so much untill she died. I think she will learn about antidotes and help the queen get better.