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Blinded by revenge, Yoo Gun resorts to torture. Meanwhile, IRIS's next mole in the NSS slowly begins to sabotage their operations.
IRIS and the NSS go head to head in a joint hostage situation. Yoo Gun secretly joins the fight for his own reasons.
Now that the nuclear weapons are in the NSS's custody, there are debates on whether to use them for power or destroy them to maintain peace with their ally countries.
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?