Thanks for translating this, I really look forward to what'll happen next.
That said, I have a couple gripes with the plot of the novel the mc transmigrates to.
1 political marriages happen a lot and with the first child being a healthy boy to inherit there's no reason to mistreat him(prior to curse) . But OK it's a shoujo so the importance of love is emphasized.
2 to cure the curse they take a princess, who is a child, hostage. Why?! And How?! And why would you make the small child read the runes of the scary curse instead of an adult?! I really hope that'll be explained later in the story because none of it makes sense.
3 Diego is explained to be the the right hand man of the imperial family but then Alejandro thinks he'll inherit the throne? If he's the crown prince why introduce him as something else?
PS: Sorry about the rant. I really look forward to seeing the MC protect the ML heart.