His mother was the first wife when the previous emperor was just a prince. When his brother (the crown prince then) died, he stripped his wife (daughter of count) of her status, (it seems it wasn't simple divorce but by annulment.) And married his brother's fiance (daughter of duke, FL's mother)
And this annulment made his two children from first wife illegitimate.
So they hate fl because she took their status from them
Ohhh gotcha the translations made it weird to understand that
She didn't take his status from him.
That's how they see it, she's considered the only legal child while they are, even though they were born from a legal marriage and older from her, became illegitimate and lost his heir position to her.
Not to mention before the regression the half brother as emperor corrects the records and makes mc's mother marriage void and she becomes illegitimate. That's how he made her marriage void and her daughter a bastard too.
I’m so confused why the prince half brother hates fl sm