When the fog in the mountain city of Chongqing becomes the genetic code that spans time and space, the symbiosis of fear and courage will unveil the ultimate proposition of the universe.
In 1941, the Japanese army planted a "fog core" bomb carrying fungal spores on the Huangge Ancient Road in Chongqing in an attempt to use fear as fuel to create biochemical weapons. After the explosion, the fungus merged with the old yellow oak tree to form the fear-devouring "Granny Fog". Every four years, the descendants of the survey team were selected as "chrysalis" containers, starting a cycle of fear. In 2023, while investigating the disappearance of his mother, forensic entomologist Lin Qiu was accidentally involved in the space-time resonance of the fog core, and discovered that he was actually a gene-edited "symbiont experiment" and shared life genes with his sister Lin Qian. As letters from the deceased reflected in the light rail, the space-time key to the butterfly cemetery, and the special birthmark of his adopted daughter Xiaodie emerged, Lin Qiu gradually uncovered the "butterfly code" in the family's bloodline - a gene of courage that spans time and space, and a symbiotic link connecting all dimensions.
