In "Iris 2," the NSS team discovers that IRIS is planning a massive attack on South Korea. The NSS team goes on a mission to stop IRIS from carrying out their plans. However, they face many obstacles, including double agents and traitors within their own agency and unexpected allies in IRIS.
Meanwhile, Yoo Gun meets a woman named Ji Soo Yeon, who is a former agent of the disbanded IRIS. As they work together, they find themselves drawn to each other, but their personal feelings are put aside as they focus on completing their mission.
The series is filled with high-stakes action, political intrigue, and intense emotional moments. It explores themes of trust, loyalty, and sacrifice as the characters struggle to protect their country and the people they care about. In the end, the fate of the nation rests on the shoulders of Yoo Gun and the NSS team as they face their greatest challenge yet.