This drama tells the story of the police who catch criminals and the firefighters who put out fires working together on the scene. The passionate detectives and the firefighters and emergency rescue team members rushing into the flames are dispatched to solve crimes, emergencies, and crises. Kim Rae-won plays the role of Chen Haokai, a police officer of the National Police Agency. He is a perfect policeman with a sharp tongue, a hot-blooded hound, and has an outstanding ability to read the inner psychology of criminals.