How to Tame the Merciless Villain

I transmigrated into the novel called "The Treacherous Sorcerer" as a supporting character who's destined to be killed by Kian, the main villain of the story. According to the original plot, Kian ends up slaughtering every single noble in the empire-including me-so I must do everything in my power to stop him and save myself from an untimely death....