The Inauspicious Route to my Happy Ending

Seo-jun was an average college student until one day an accident took his life away. He suddenly found himself waking up in the body of Adrian Mallorne, a minor antagonist side character in a novel he read once before. Excerpt: "So, the Crown Prince is an Aura User, if the book is anything to go off of, and the third prince is a Spellsword? Why does the second prince seem so underwhelming next to these powerhouses?" . . . Sitting on the other side of the Crown Prince was a man with hair that was as blinding as a freshly minted gold coin. His facial features were sharp like the Crown Prince's, but Adrien could tell even from this distance that the man's eyelashes were long and thick and that his eyes were just slightly curved up, much like a cat's. And speaking of those eyes, his irises were a deep and intense red that could put any jewel to shame. And those beautiful eyes were trained on him. To borrow Seo-ah's words, 'this guy is freaking hot,' flashed through his mind. That was the first time Adrien ever agreed with that particular saying. But who is that red-eyed guy? Could he be the second prince? It was possible since he looked a lot like the description the author used for the king. But why would the second prince stare at me? Did he know the Original Adrien even though I don't have any memories of him? And how is that the face of an unnamed background character who doesn't even appear in the book?