No, he called her as 'dear sister', so it's definitely the second prince as the engagement to the first prince made her his future sister-in-law
I thought he called her sister in law because he was engaged to her younger sister though? But I might be wrong there
For now the first prince's fiance is the younger sister, yes. But the other person said "but the engagement was annulled so she's no longer your sister" so i'm pretty sure he called her sister because of that
His name is Prince Stephan he's not the one she was engaged with. Their hairstyles are different too. His hair is longer than Prince Alvin's? (or something similar like that) who is the FL's ex... We do not know what is wrong with the brain of Stephan or anyone of that country for that matter. Let's try not to think too much of it or we might become stupid ourselfs... (￣∇￣")
For that one meme about the decapitating thing aren't those two different princes, like the one who wanted her to die is the second prince but the other one is the first prince right?