There are two completely different groups of policemen in the 2 1 area of pd in Chicago. One group is uniformed police, who patrol the streets and directly crack down on and deal with street crimes. The other group is called intelligence group, which is responsible for cracking down on the main cancer that harms the city-gang crime, drug smuggling, high-level murder and so on.

Responsible for leading the intelligence team is officer Hank Voight (Jason Beghe). He is a man who is not afraid of breaking the rules-as long as he can uphold justice, even if it is against the law. He has a tough style and strict requirements, and only those who can go up and down can work under him. Take detective Antonio Dawson (jon seda) as an example-although he and his boss have a complicated history, he is full of ambition to lead such a team. Even if it means that he has a hard time with Beuter every day, it can't stop his determination to stay.