That's unfortunate lolSummary of Volume 2
Basically the other country is sending their royal kids to this kingdom to study, but it’s actually a way to finally settle an issue they had. There was basically a scandalous affair that resulted in a pair of siblings having royal blood but they don’t have any claim to the throne despite what their parents keep claiming, one of the parents is a ex-royal who lost claim to the throne cause of the affair. Their half brother is the only legitimate heir, but the siblings basically bully him. And there have been attempts at assassinating him, with the dumb assumption if he dies, one of his half-siblings would be able to claim the throne despite the king already decided they are not recognized as royals.
Serena gets dragged into kinda babysitting them. But she later learns that the other kingdom is hoping the sibling pair cause problems and makes it easier to deal with them. Serena also ends up getting a gun to help with her assassination work.
Serena ends up training the legitimate heir so he can protect himself at least. After many failed assassination attempts against him and the sibling pair screw up badly, the brother of the pair ends up getting killed by the legitimate heir. While the sister ends up becoming a honey trap type assassin since she got the skills to seduce men and has the looks to go with it. Said sister also killed her parents iirc because she found out she and her brother were just being used by them.
Meanwhile zero development happens between Evan and Serena. Evan’s family basically diss him for not making any progress in his attempts to romance Serena.
Oh well, thanks for the spoiler at least!