I’m Going to Rewrite the Devastating Novel

[Let’s get rid of this psychopath before that]
Yes, I possessed someone, but I can’t remember at all who I was in my previous life. All I remember is just this guy’s face before my eyes. We were together the day I opened my eyes for the first time as one of the many test subjects of the Magic Tower wizard’s experiment. And strangely enough, this guy seems to know more about my previous life than I do.
This is the world of a novel, a tragic novel with only pain and misery for every single character, where the only one I can trust and rely on for survival is myself, I have to run away from this guy who, in the future, will kill the female lead’s entire family. He is a psychopath seeking the destruction of this world. And finally, I managed to escape his grasp and thought I could live a peaceful life.
“You cruelly abandoned me.” He finally found me.
“Did you enjoy playing with me?” Now he can’t even be compared to his past self. He has gone completely mad.