Crown Prince-2

Caelan, the crown prince who later gets revealed to be a lunatic villain that'll murder everyone in the palace including his family and finance, and is later executed by the hero of your favorite historical novel.

It was just a fun fantasy you read but now you got reincarnated as the same finance who gets murdered by Caelan

"Is something the matter?" Caelan asks at the dinner table since you weren't eating anything and had a dazed expression.