Under the wings of Barrister Liang Sheng, the tyrannical Four Seas Group gradually washed itself clean and became respectable. The emergence of the huge diamond, the Wall of Nine Dragons, made the police realize that this was a great opportunity. Zhao Jinhao was calm and determined, and was also a nimble fighter. On the instructions of his superior, he adopted the alias Guo Hao and secretly conducted investigations. Liang Sheng sensed the police's involvement and proposed to stay a low profile and give up the diamond. Black Snake and Liang Sheng got into a disagreement and fell out over it. Guo Hao wanted to trade the diamond with Black Snake, but found that the diamond had been switched. When he investigated, he found that Lin Yue was actually a subordinate of Black Snake. Hitman Steel Tiger and Guo Hao began a fierce chase after each other. Guo Hao realized the severe danger of the operation and instructed An Ning, his assistant, to go into temporary hiding. He had not expected Steel Tiger would kill An Nin