Sinopsis: A comical crime investigation drama depicting the process in which the worst violent crimes unit in the country and the best elite violent crimes unit leader meet and grow into the strongest team. The Songwon Police Department's 2nd Violent Crimes Unit, which has the lowest arrest rate, loses its team leader after a failed undercover investigation and moves its office to a closed daycare center. The new team leader, Dongbang Yubin, appears before the 2nd Violent Crimes Unit. At first, Yubin is suspicious, but as they solve cases together, they gradually build trust in each other and become a true team. Dongbang Yu Bin is the tall, intelligent and athletic head of Songwon Police Station’s homicide squad. He was offered a permanent professorship at a famous overseas university, but he suddenly came to Korea and volunteered to become the head of the Songwon Police Station’s homicide squad Unit 2, which ranked last in the country in terms of arrest rate.