Trapped Inside a Novel as a Hidden Character

(PAUSED) One night, Faerie remembers that she wants to read a novel that was recommended by one of her students. Unfortunately, she forgets what the title was and decided to read another novel that she accidentally found on an old website. Because of how horrible the ending was, Faerie ended up leaving a review full of insults for the novel that has ended for years. It seems that this website has been dead and maybe she was the last visitor to this website. So she believes that her review won't be read by anyone. And just like that, Faerie left a review full of gag nonsense. "The worst ending in the world. If you, readers, agree with my opinions, gimme a million likes! Maybe there's a miracle for me to be transmigrated into this novel so I can change this shitty ending to becoming the best ending all of the time!" And now Faerie regrets her review that night. Faerie did transmigrate into the shitty novel by its writer who proclaimed to be a God. And her bad luck didn't end there. Faerie now possessed a hidden character's body whose destined to die at the hands of a tyrant. Now, what is Faerie supposed to do to change the shitty storyline into the best ending all of the time, and return to her life on Earth? --- Author's note: Related to chapters 01-13 which explains how the MC was able to enter the novel's world and why she was obliged to sign a contract by the Goddess with the reward: 'her life in her original world'. At the start of the story, I purposefully do not shorten and write in detail. That's because I want readers to feel the MC's mindset shift after meeting and interacting with all of the novel's characters, which was initially just focused on how to accomplish the contract. Although I am aware that you may become bored while reading 01-13, I encourage you to continue reading! Cause I am certain that this novel will not bore you! (Don't worry, this is a long story, and the MC definitely has more to do (ahem) with the Male Lead.) system (check) transmigration (check) werewolf / cursed ML (check) overpower MC (check) historical and fantasy world-building. (check) romance(+) and friendship (check) (a little) adventure and action (check) and a warm family story (check)