Qin Yun, a new criminal investigation psychological counselor, is involved in the darkness of society and the test of human nature due to a serial disappearance case. She formed a temporary alliance with journalist Song Xinran, criminal investigation captain Su Yao, psychology professor Lin Xuedi and mysterious hacker Zhou Jian to trace the case. As the investigation deepens, it is discovered that financial fraud, cyber violence, family secrets and urban power struggles are involved behind the case. Multiple story lines are intertwined and advanced, presenting the survival plight of the city's bottom class, elites and marginalized groups. The protagonists each face the struggle between the past and reality, and are driven by the case to grow and redeem themselves. Under the heavy fog, the truth gradually emerged, and the originally independent cases finally converged and intertwined, revealing a shocking conspiracy and the dark side of human nature. The ten volumes of chapters progress layer by layer to complete self-salvation and justice.