Again I question how does she not know this is the 2nd prince? As both the reader of the OG story and also growing up as a very powerful noble. Also I feel like what could be an ok series is being ruined by the storyboarding and art (The art looks fine but the scenes are almost always off, like not showing things correctly so your left punched in the cheek wondering whats even happening and the events leading up to what happened.) like this isn't some 8/10 being lowered it's like a 5/10 at best if it was better cause the writing is pretty ass too.
From what I understand, the Second Prince didn't really have that big of a role in the novel. I assume the reason he's in the picture now is because she changed so much of the story by learning magic that they've paired. Also, the Prince didn't tell her his real name and mentions that no one from outside the palace would know his face. He was essentially banished and was living quietly since he was a baby because his father hated him, and his existence threatened the Crown Prince's position. She has been trying to live her life also as quietly and detached from the outside world as possible because she didn't want to be perceived as a villain. So, I assume this is why even though she comes from a powerful family, she wasn't interested enough in learning anything about the Second Prince until maybe now.
That said, I agree with the storyboarding, especially when there are "action scenes" that don't really show the action. 😬