I Can't Die Before the Novel Begins

A political marriage conducted under a sacred oath in the name of God. During the wedding ceremony, memories of my past life flooded back. I'm a character who dies before this novel even properly begins. And it's by assassination, an event not even detailed in the book! Why! Who? When? Where?! Who do I have to ask to find out how I die?! 'If I ate it, I won.' Just as I was about to fall back with a triumphant smile, something touched the back of my head. "Mmph?!" I was soon pulled forward forcefully. Even though I had already swallowed all the medicine, he began to rub every corner of my mouth as if he had to convey the taste remaining on his tongue to me. And finally, he seized my tongu...