The GJ Ministry of Ecology and Environment secretly trained a group of team members to enter certain typical companies undercover under different identities to investigate and collect evidence. As qualified team members after receiving training, Chen Mo and Wu Yan applied to the Haishan Group as environmental engineers and deputy directors of the Ministry of Environmental Protection respectively. They went through hardships, ignored life and death, and overcame many difficulties. They finally obtained evidence of environmental pollution crimes from a certain enterprise and brought the criminal enterprises to justice. In the follow-up actions, they solved multiple environmental pollution cases and experienced more thrilling moments.