Interpol captain Lu Chenfeng was falsely accused of murder. After being imprisoned, he went crazy and became a demon. He carved the scene of the murder on the prison wall at night. Fiancée Su Yan secretly keeps samples of deadly poison, and deaf-mute prison guard Chen Xiaohe secretly records his crazy words to spell out the truth. When the real murderer Lin Zhao launched a purge plan and Lu Chenfeng escaped from prison and massacred his family, Su Yan secretly guided him into a bigger murderous situation. Madness and intelligence are intertwined, and the truth is reshaped in a pool of blood - what they want is not to reverse the verdict, but to collapse the entire system.
