A mystery will be revealed surrounding Hyun Joon's death and Baek San, who has been arresting for being active in an illegal secret organization, three years after the death of Hyun Joon. IRIS, a mysterious group which controlled everything through Baek San, but yet so powerful. Is Yoo Gun up for the task to dissolve this organization?

Agent Kim Hyeon Jun is part of a top secret South Korean organization called NSS, while assassin Vick was paid to kill him by an organization called IRIS.

The story is all about betrayal, trust and conspiracy of North and South Korean secret agents.