Crime Crackdown is based on real cases. In order to hinder police officer Li Chen Yang (Sun Hong Lei)’s investigations, his superior frames him, which causes Chen Yang to end up in prison. Nonetheless, Chen Yang never loses his will to investigate the truth. After being released, he joins forces with officers Lin Hao (Lay Zhang) and He Yong (Liu Yi Jun), and together they bring down two criminal gangs who have been ruling the underworld in the city for over ten years. At the same time, they also expose corrupt officials who have been protecting those gangs.
Huang Cheng Dong (Sun Hong Lei) accompanies his son Xiao Dong (Joseph Zeng) to America where Xiao Dong will study. Even though Cheng Dong had planned to return to China after his son settles down, he ends up staying in America as well and tries to help Xiao Dong adapt to the new environment. But chaos begins when Xiao Dong falls in love with his classmate Wu Dan Dan (Jiang Yi Yi), another Chinese foreign student. Through Dan Dan, Cheng Dong gets to know her father’s girlfriend, Lin Sa (Xin Zhi Lei), and when school bullying becomes an issue, Chen Dong and Lin Sa work together to solve the problem.
Zheng Qiu Dong (Hu Ge) is a persistent man when pursuing his ideals. He survives through business failures, economic pitfalls purposely set up by adversaries and unfortunate romances without losing his moral principles to become an elite of the financial world, described metaphorically as the “hunting ground”.