A few months ago, a strange fog swept across the world. Modern thermal weapons were completely ineffective against the strange things born in the fog, and large cities around the world fell into death one after another. The survivors could only form a migratory convoy and escape along the foggy road to the legendary final refuge 'Tiandu'. Night and shadow are a hotbed of weirdness. Human beings struggle to survive under the laws of fog. Only a handful of people who have awakened the 'Forbidden Mark' can confront the weirdness head-on.
