The series relates the story of police officers Wang Jianjiang, Zhang Buwei, and others in their grass-roots work and daily lives. They are willing to take responsibilities for the safety and welfare of others as well as overcome numerous difficulties to provide a more practical form of security and heartwarming police services to the people they serve. While dealing with his normal trivial jobs, Wang Jianjiang discovers leads to a big case. The police departments of the city unite together and cooperate with solidarity to end a major criminal organization.