This is a story about an unusual duo of law enforcement officers from Korea. The main characters work in one of the major precincts in Incheon, tracking down the most dangerous and cunning criminals. Kang is used to relying on old proven methods - personal connections and a vast network of informants throughout the city. On the other hand, his young partner Oh avoids unnecessary contacts, trusting only forensics and irrefutable evidence. It turns out that together these two are twice as productive. They are an exemplary detective team.