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Yoo Gun has been requested to join NSS, while Choi Min has been appointed as new director of NSS solely to hunt down IRIS. Under command by Ray, IRIS leads a mission in order to retrieve Baek San.
When Yoo Gun barely escapes together with Baek San, it seems the NSS has still a mole within their organization. To repay his debt, Baek San warns Yoo Gun that IRIS will do something big during the talks between North and South Korea in Budapest.
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?