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IRIS and the NSS go head to head in a joint hostage situation. Yoo Gun secretly joins the fight for his own reasons.
In an attempt to eliminate Baek San, an unexpected casualty occurs instead.
Blinded by revenge, Yoo Gun resorts to torture. Meanwhile, IRIS's next mole in the NSS slowly begins to sabotage their operations.
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?