It was brought up by lucas a while ago tho
i agree. the only isekai i've ever read that actually mentions that is "the reason why raeliana ...." so either other stories probably think its irrelevant to the plot or the authors dont care to mention it further. but in this story lucas is the only one who knows about it cause he's the only character that will actually make that information relevant. (claude for knowing about his child being isekai-d for ex. wont help the plot but lucas having that information makes a difference to the story) because personally, i think the concept here isnt her life in korea but her knowledge of the book lovely princess. her experiences in the modern world don't do anything but give her personality and logical thinking in the present timeline (which is probably why they dont bring it up) on the other hand her knowledge of the lovely princess book is what she can actually apply in the present timeline.
I think the arc about her isekaid already ended.
So is it never gonna be brought up that the MC is originally a grown woman from another universe? I like the story. but what was the point of this being an isekai