Eight years ago, Ni Xiting could not let go of the accidental drowning death of his father Ni Zhen. After graduating from the University of Political Science and Law, he returned to his hometown to intern at the court in a small county, just to secretly investigate the truth. He found Gao Zhikun, who was an eyewitness and had been in prison for eight years for intentional injury, but was repeatedly rejected.
Yun Shiyu, who had a crush on him, followed, and Ni Xiting was forced to reveal his obsession. After asking for clues from his mother, he finally learned the cruel truth from Gao Zhikun: Ni Zhen was silenced for uncovering the secret illegal activities carried out by Sun Liguo and others. Gao Zhikun acted bravely and stabbed Sun Liguo in the eye in desperation, but was sentenced to eight years in prison. However, the direct perpetrator Sun Liguo and a certain consortium behind him were safe and sound.
At this time, the kidneys of a female corpse disappeared mysteriously, and the method was exactly the same as before. As the investigation deepens, forensic doctor Xue Zhizhuo encounters misfortune, Sun Liguo dies in custody, and intern doctor Zhang Haoran and others die one after another. An intricate and secret chain of interests involving forces related to a certain consortium gradually emerges. With the help of everyone, Ni Xiting finally exposed and stopped the operation of this chain, but revealed the cruelest truth: the illegal transaction was to save Yun Shiyu's life, and the instigator behind it was Yun Shiyu's father Yunyong.
Yun Shiyu couldn't bear it, so he risked his life and conducted an in-depth investigation to atone for his sins. Eventually, the crime was exposed and the relevant criminal gangs were dismantled. Sixteen years later, the two met again, their faces covered with dust and their temples as frosty as frost. The film is titled "The Difference Between Clouds and Mud". In the pursuit of the truth and the entanglement of emotions, it not only reveals the gap between fate and luck, but also illuminates the eternal division between light and darkness in human nature.
Purpose: In the intertwining of revenge and love, it reveals the "difference between clouds and mud" in the fate of classes and interrogates the light and darkness of human nature in desperate situations.