In this city that never sleeps, light is never absent, but the shadows deep in people's hearts never recede.
Lin Yifan, a young criminal psychologist, noticed the disturbing factors hidden behind a seemingly ordinary suicide case. As the investigation deepened, he discovered that this was not an isolated case - behind every seemingly accidental death, there was an unknown "leader" involved.
At the same time, a social experiment on "moral boundaries" quietly unfolded. Awakened conscience, repressed desires, and seduced evil thoughts are intertwined into the core of this urban crisis. Lin Yifan had to search for the truth in the fog, but found that the price of the truth may be the side he least wants to face.
