Red fog sweeps across the world, turning cities into forbidden areas full of death rules. You can die instantly by opening the door, turning on the lights, or walking the wrong way.
24-Year-old Su Lin relies on the rule notes left by her mother who has been missing for three years to survive in a desperate situation.
She awakened the ability to sense rules, broke through layers of death traps, and fought against strange existences, just to find the whereabouts of her mother. However, she accidentally broke through the shocking conspiracy behind the red mist restricted area, which was enough to overturn the world.
