In addition to the intelligence department's fight against drug trafficking and solving cases, "Chicago Police Department" tells us about the various things that the main members face inside and outside the police station. In the new season, it will continue to show the front-line life of these blue guards. In the last season, Antonio's drug addiction caused a disaster, and Chief Kelton was elected mayor by unscrupulous means but was killed by gunpoint. Where will Ruzek go after he took the blame without authorization? Can Voy, who is good at both black and white, continue to control the situation? How much trust does Halstead, who is full of doubts, still have in him? What choices and decisions will partner Upton and police officers Atwater and Burgess make?