A "fog of oblivion" of unknown origin swept across the world without warning. People swallowed by the thick fog will not die, but will lose all memory and self-understanding, and become "echoers" who can only wander around following their instincts. In the early days of the apocalypse, meteorological data analyst Su Wan relied on his extraordinary professional sensitivity and data analysis capabilities to discover that the occurrence of dense fog was not a natural disaster, but a regular and predictable "man-made disaster." She is one of the few survivors who can predict the timing of the "fog".
In order to find her missing family members and uncover the truth behind the fog, Su Wan embarked on a difficult journey of survival. On the way, she rescued Lu Jin, a former member of the special forces who was besieged by the "Echoers". Lu Jin's combat prowess is off the charts, but he seems to have been traumatized in the fog, his memory has gaps, and he is wary of everything in the outside world. Su Wan's calmness, wisdom and accurate prediction of data allowed Lu Jin to gradually let down his guard and become her most reliable guardian.
The two walked together through the dead city, the strange survivor stronghold and the unpredictable shelter. They continued to collect scattered data and clues, and discovered that there was a shocking conspiracy about memory transplantation and mind control hidden behind the "fog of oblivion". The highlight is that this is not a simple survival story of fighting monsters, but a battle of wits that relies on logic, reasoning and data analysis to solve the mysteries of the apocalypse. There are no misunderstandings or bloodshed between the male and female protagonists, only mutual trust in desperate situations and the only pure emotion for each other. Their love is the last line of defense that supports each other to maintain humanity in the apocalypse.
