My Brain Is Still Running Original

I am God among the reborn. Predicting the future and controlling destiny, countless time travelers beg for my guidance. But they don't know that every "counterattack" they make is improving data for the higher-dimensional "Star Monitor". Our brains have long been soaked in a vat and become the nourishment for building a "perfect world model". Until my system popped up an error warning: [Unknown variable detected: Your brain seems to be still running in its original form. A cold mechanical voice then came: "Congratulations, you have become the performance evaluator of the 'Star Monitor'." "Your mission is to find out the person who is hiding among the reborn people and has been pretending to be controlled -" "Yourself."