Man this took me a long time to create but I'll give you some info pookie:

Look, in short, you're supposed to be the villain of the story, you can also be an anti-hero or whatever.

Your main objective is not to die in the story like the original character does since you have been reincarnated in a book you were reading.

You are the Emperor's fiancé and about to get married, but he is having doubts due to the time he spends with Selene.

Your character's last name is Draconis, that's how I put it in the story, but if you want to change it (I mean the last name because the character doesn't have a name) I don't know if there will be problems, but you can put whatever name you want.

Well the character Selene is a Scolar, A young girl who comes to help with things related to the empire and from a rich family just like you (Although yours is richer (⁠◠⁠‿⁠◕⁠))

The way to get yourself killed is to follow the original story, which would be to try to assassinate Selene and get caught.

Something you can do is really make the emperor fall in love with you and make him love you and not end up falling in love with her.

Or you can let them have their happy story and give up on your plans to rule the empire.