Really? This topic may contain spoiler
I was told that Jonas' biological mother left some kind of will to Rudiger's mother that she has to treat someone with purple eyes respectfully. The reason was because of his father (the emperor) is obsessed with purple eyes. The princess was also a victim of her father's obsessive behaviors so she escaped from the palace by using the marriage.
When the emperor learnt about Judith's existence later, he also prohibit her from having relationship with Rudiger, so both of them can only date in secret
This maybe a spoiler or a theory:
.
.
.
.
.
.
.
In the family tree of the whole story's characters, the father of the king had a sister named margaret who also married a commoner, she was fls grandmom, maybe she was the cause of the bros to protect purple eyed girls since the olden timess get overprotective (?) Not sure just a thoery

At first i thought that Luca was reborn like Judith but some comments said it was older Luca went back in time as young Luca which is twist plot. This is so interesting, I can’t wait to read more!
And is Judith’s eyes special? You see Jonas’s biological mother, Princess, has similar eyes as Judith. Is there a possibility that Judith has a royal blood like illegitimate child? Who knows? :0 (I know duchess said that because she missed the Princess)