Bizarre spontaneous combustion cases have occurred one after another in Jiangcheng, and the deceased all have strange smiles on their faces. When Detective Lin Yan was investigating the scene, his ancestral police badge became hot and awakened his ability to see through the aura traces, and found that the deceased had a strange aura left behind. As the investigation deepens, he uncovers the conspiracy of an evil cult organization that uses the essence of living people to cultivate - every surveillance blind spot in the city is a hunting ground. Lin Yan relies on his special abilities to pursue evildoers in the city where light and darkness intertwine, and starts a life-and-death battle with evil cultivators.
