IRIS 2

When Yoo Gun is scouted by the NSS, Soo Yun sets her mind to joining as well.

When IRIS infiltrates the NSS's safety house, Yoo Gun considers the possibility of a spy within his team.

Just as Baek San predicted, a third party interferes with the North-South Unification talks in Hungary, resulting in the TF-A Team's most dangerous mission yet.

Hyun Woo is assigned a solo mission in Cambodia to track down Yoo Joong Won.

Parts of Baek San's past reveal a connection to Yoo Gun's father. Meanwhile, Yoo Gun weeds out the mole inside the NSS.

After IRIS interferes with the NSS transfer mission, Yoo Gun goes missing and is presumed dead by most, making Soo Yun the new leader of the TF-A Team.

As Yoo Gun begins to remember bits and pieces of his past, Rey tries to prevent him from figuring out more. Hyun Woo becomes more forward about his feelings for Soo Yun.

Yoo Joong Won's true intentions are exposed. Meanwhile, both IRIS and the NSS prepare for the next Unification talk.

It's a race against time when the NSS has 24 hours to track down the terrorists behind the missing North Korean Representative, Park Choon Sung.

Soo Yun debates telling the NSS about Yoo Gun being alive, since he's now an IRIS operative.

IRIS offers the NSS a difficult trade, Jung Yoo Gun for Baek San.

Yoo Gun finally returns to the NSS, but this time he's on the other side of the interrogation table.

In an attempt to eliminate Baek San, an unexpected casualty occurs instead.

IRIS and the NSS go head to head in a joint hostage situation. Yoo Gun secretly joins the fight for his own reasons.

Blinded by revenge, Yoo Gun resorts to torture. Meanwhile, IRIS's next mole in the NSS slowly begins to sabotage their operations.

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.

Baek San tries to convince Yoo Gun to give up on his revenge against Joong Won before he and the people closest to him suffer.

Hyun Woo has a hard time forgiving Soo Yun for suspecting him as a traitor. Choi Min secretly plans to hand over the nuclear weapons to the U.S. Army.

When IRIS compromises one of the nuclear bombs, Yoo Gun, the NSS and Baek San all take matters into their own hands.

With the means of a nuclear bomb, Yoo Joong Won takes his final stand in an attempt to start a unification war.