The Female Protagonist Killed the Male Protagonist

One day, after the original story had ended, the female protagonist killed the male protagonist—and then I died too.
***
I became Raylin, a supporting character in a villainess possession novel.
The female protagonist’s best friend, relationship counselor, emotional dumping ground, and walking wallet.
I faithfully played my assigned role according to the original story.
“Raylin, I can never forgive you.”
Murdered by the female protagonist, who had been driven mad by her delusions, I miraculously returned to the past.
Determined to destroy the original story, I resolved to fight back and sought a powerful ally to stand against her.
“You were the one who made the first move—now take responsibility.”
But unexpectedly, I found myself deeply entangled with the story’s villain, the crown prince, Aiger…