The story revolves around a series of mysterious cases that Su Jin took over ten years after her mother mysteriously disappeared. As the investigation deepens, Su Jin gets acquainted with police detective He Ruchu, psychologist Lin Yufeng, and lawyer Ye Jin. The fates of many characters are intertwined, and the same mastermind is hidden under the surface of many cases. Each volume reveals a new mystery, and the relationships between the characters are constantly changing. In the process of revealing the truth, the protagonists face life and death, crisis of trust, growth and transformation, and finally face their own past and the dark side of human nature. In the finale, the secrets are revealed layer by layer, and the truth comes to light.
