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When the North Korean spokesman has been assasinated by IRIS, Both teams of Yoo Gun and Chul Young are hunting down the killers. Unaware of the fact that the South Korean spokesman is without protection.
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.
After failing to protect Jo Myung Ho, Yoo Gun has been sent off for a month as punishment and comes face to face with Ray. Deputy Director Choi Min orders Hyun Woo to catch Joong Won in Cambodia.
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?