The real world is dominated by the shadows of ghosts, with fear becoming the most common emotion among humans.  In the eyes of ghosts, humans are merely slaves, their food.  John, due to a premeditated accident, gained the ability to enter the Thriller World.  At the same time, he was granted two systems: Demon and Angel. Demon System: can obtain random rewards by absorbing the negative emotions of your targets. The amount of reward is related to the intensity of the negative emotions." (Negative emotions include anger, fear, etc.) Angel System: can obtain random rewards by absorbing the positive emotions of your targets. The amount of reward is related to the intensity of the positive emotions." (Positive emotions include fondness, adoration, etc.) With the aid of the Demon and Angel systems, John becomes the most formidable entity in the Thriller World. In the face of absolute power, all fears become inconsequential.