As South Korea became a hub for drug distribution, the government established a drug-specific agency. Shin Ki-ju, head of the Special Investigation Team 1, and his team track down a drug organization and catch the suspicious movements of the Sunil Foundation.
At this time, while Kang Chang-soo of the Sunil Foundation, who was distributing drugs, was trying to embezzle the organization's funds, an unexpected accident occurred and most of the people at the scene died. Colleagues from the special investigation team also became victims in large numbers at this time.
Meanwhile, Shin Ki-joo knew that Kang Chang-soo, who he thought was dead, is alive. His colleagues, Choi Ik-pyo and Kang Chang-soo, are becoming more and more intimidating... Strangely enough, the closer they get, the further away Kang Chang-soo becomes.
What was the black connection with Kang Chang-soo?
The story of an investigation team trying to arrest drugs and a drug dealer who will do whatever it takes to satisfy his greed.
What will be their ending with a twist?