Lu Fan, the "world's number one idiot" who was deceived ten thousand times and left home, after believing the school belle's joke of "for one hundred dollars, I'll be yours", he awakened to the [Cause and Effect Fraud System] - any lie he believed in would become the truth! Since then, there has been a walking bug in the city. A martial arts master boasts that "pointing acupuncture points can determine life and death"? Lu Fan believed it, and the master turned into a sculpture on the spot. The ancient martial arts family clamored for "their ancestral magical skills are unrivaled in the world"? Lu Fan believed it, and the magical secret book automatically flew under his pillow that night. When the liars all over the world and the martial arts masters hidden in the city were trembling and begging him not to believe it anymore, Lu Fan just spread his hands innocently: "I have no other advantages, I am just too simple."