Travel into the Novel You Wrote

The protagonist travels through the book with a God's perspective, but finds that the plot he wrote is all "pits". He is still a cannon fodder/villain who must die. While changing the plot to save his life, he tears up the bloody settings he wrote. He is also manipulated by the "perfect male protagonist" and "crazy villain" he wrote. It has a sense of exhilaration + a sense of fate, which is sweet, cruel and reversed.