Because Changge complained about the author, he time-traveled into the author's unfinished novel and became the cannon fodder destined to be slaughtered by the protagonist - the Demon King...
On that day, all the villains knew that they would be killed by a person called the protagonist, so they decided to strike first.
On that day, the protagonist knew that he was the protagonist of this world, so he decided to keep a low profile first.
On that day, Changge accepted someone as her apprentice, so she planned to let her apprentice steal all the opportunities of the protagonist.
After that day, protagonist: Every day I listen to my idiot master and her idiot subordinates discussing how to stupidly kill me, and I feel so tired.
Highlights: The story that has to be told between the protagonist and the book wearer.
Conception: