The troublesome Zhui Ming (Ronald Cheng) and Tie Shou (Zou Zhaolong) play tricks to match up the lovers Leng Xue (Deng Chao) and Wu Qing (Liu Yifei). The people in Shen Hou Mansion are enjoying themselves, but the air smells of blood. A murder is happening in an old house in the suburbs three miles away! The four famous detectives go to the scene and try their best to chase the murderer. Liu Shanmen receives the news, and Bu Shen (Cheng Taishen) also brings Ji Yaohua (Jiang Yiyan) and others to understand the case. The two sides merge and find that this case is related to several cases of extermination that Liu Shanmen had investigated earlier. The case is still unsolved, but Liu Shanmen finds Bu Shen's body in the Stele Forest. It was Mr. Zhuge (Anthony Wong) who had asked Bu Shen to meet in the Stele Forest before. All clues point to Mr. Zhuge. In order to find out the truth, Zhuge Zhengwo returns to the Stele Forest to check, but unexpectedly runs into an old friend who has disappeared from the world for many years. When the two sides confronted each other, the Four Famous Constables and the Six Gates also arrived one after another, creating new complications. The Six Gates detained Mr. Zhuge and Wuqing in the Tianlao. The Four Famous Constables were leaderless and existed in name only. At this time, the Prince (played by Li Zixiong) suddenly visited the Tianlao and ordered Wuqing to be sentenced to death immediately by the Emperor's order. In the iron-blooded prison, a struggle of power, hatred, love, and friendship began...