I feel she's really dumb for throwing that paper out. Cause who says she's the only reinca...

I feel she's really dumb for throwing that paper out. Cause who says she's the only reincarnated who can read Korean? And who says black magic can't use her belongings to cast a powerful, long distance marriage? It was somewhat of a conceited action. If it was me I would've burnt the paper.

Now, regarding the emperor. I really hope he's baiting her, cause if he's not this whole situation is dumb as fuck.
Honestly, the princess name has no place in that conversation. As an emperor he should be focused on the empire. If black magic isn't beneficial for the empire, what do you do? You kill the bitch, it's as simple as that.
If you're worried about the princess, send her home or send her to the temple until you kill the bitch and her lackeys.
I can't see a better way to keep the princess safe, than keeping her at the temple, cause it's obvious that if that woman enter the palace something's gonna happen and she's also much capable of following the princess to her home country just to get rid of her or at least sending lackeys.

Also, let's be honest, if he marries that bitch the princess is gonna die right after by her hands, so if he even considers it, I give up on his braincells.