Forensic doctor Lin Jingxuan uses his expertise and iron will to lead the “Iron Triangle” team, comprising himself, criminal profiler Su Wanqing, and detective Chen Nuo, in solving a series of bizarre murders. As they dig deeper, clues hidden behind the cases point to the secret past of his late mentor, Gu Mingyuan, and uncover a vast conspiracy network led by “Judge” Gu Yehua, who exploits legal loopholes and psychological manipulation to exact “private justice.” In their pursuit of the truth, they must not only face cunning, ruthless adversaries, but also confront the depths of human nature and trials of trust. Ultimately, in Jianglin City, where light and darkness coexist, they will face off in a final battle over justice and redemption.