為了南北統一需要龐大資金的政府成功開發了叫TWR的高尖端原子能技術，受到世界各國邀請韓國轉讓原子能發展技術的請求。政府為了防止因此發生的恐怖襲擊，成立了針對危機發生的機構NTS。從國情院派到NTS的政宇（鄭雨盛）對即將開始的間諜人生滿懷期待。有一天政宇接到去意大利調查恐怖分子們新動向的任務，他帶著自己監視的前朝鮮對外政府調查部要員金基秀（金民鍾）來到意大利。不料政宇追趕的恐怖分子們綁架了總統的女兒，韓國為此派了在熙（李智雅）為中心的 NTS要員，但是真正和恐怖分子們展開談判的人竟是突然出現的惠仁（秀愛）。神秘的惠仁以及隨後出現的美國國土安保部東亞支部長孫赫（車勝元）的出現，讓NTS要員們感到混亂。這一過程中政宇瞭解了NTS內部有個叫『solution』的秘密組織，更讓他吃驚的是惠仁竟然也是這個組織的成員。政宇接近『solution』，試圖瞭解惠仁的秘密，但是越來越發現更多的疑問，他預感到這個組織的背後存在著龐大的力量，那就是改變世界權利組織的巨大陰謀『雅典娜』。但是政宇越接近『雅典娜』，真相越離他遙遠，他並不知道悲劇正在一步步接近他。

        Jung-woo was assigned to NTS, which was established to prevent negative aftereffects of the development of the next-generation nuclear reactor TWR. As President Cho Myong-ho’s daughter Soo-young has been targeted by terrorists, he began to guard Soo-young secretly under cover. But while they were looking away for a moment, Soo-young is kidnapped. To rescue her, the combined Korean-U.S. team led by Son Hyuk is dispatched, including NTS agent Han Jae-hee in activity in Europe. Under Son Hyuk’s excellent direction, Jung-woo, Hye-in and Jae-hee start to work together on the investigation. Around that time, a terrorist group attacks and captures weapons of mass destruction (WMD), which were in the process of disposal under surveillance of a UN inspection team. Later they found out that the nuclear bomb was stolen by terrorist who has received information from someone. And that, Jung-woo begins the fight against the invisible terrorist group threatening the Korean Peninsula and the invisible power behind it, risking his girlfriend’s life and his fate.