Sometime in the near future, the Korean peninsula attempts to reunify. The South Korean government, which needs enormous funds for the unification to succeed, develops a landmark new technology called the TWR. The TWR is a high speed nuclear reactor and other countries want the technology. To prevent terror in the aftermath of the TWR breakthrough, the government establishes a new organization named NTS (National Anti-Terror Service). Jung-woo (Jung Woo-sung) is transferred to the NTS group from the NIS. He's excited about the transfer and hopes to live the life of a real agent, but then discovers his main responsibility is to watch North Korean defectors. One day, Jung-woo is given the order to travel to Italy to track terrorists from North Korea. Jung-woo goes to Italy with Ki-soo (Kim Min-jong). Ki-soo is a former North Korean agent who has defected to South Korea. Ki-soo's specialty is information on the European region. Up until now, Ki-soo was one of the North Korean defectors that Jung-woo had to monitor. While in Italy, Soo-young (Lee Bo-young), the daughter of the South Korean President Jo Myeong-ho (Lee Jeong-kil), is kidnapped by terrorists. To solve the case the Korean government sends additional NTS agents including Jae-hee (Lee Ji-ah) to Italy. The NTS agents are able to negotiate with the terrorists, but during their negotiations Hye-in (Soo-ae) suddenly appears. Jung-woo and the other agents are surprised. Hye-in works as a guide at the exhibition hall in the NIS building. Jung-woo has always held strong feelings towards Hye-in, but he has never expressed his feelings towards her. Following Hye-in, Son-hyuk (Cha Seung-won), the chief of the East Asia branch of Department of Homeland Security in the U.S., suddenly appears as well. The NTS agents are mystified by their appearance. Jung-woo learns that there is a secret "solutions" group within the NTS whose sole responsibility is to solve problems that others agencies can not. More surprisingly, Hy
A race to capture a North Korean nuclear physicist leads to the detention of Agent Kwon. Lee Jung Woo receives an overseas assignment from NTS with a new partner.
Watch Now:AmazonUnable to let go of Hye In, Son Hyuk keeps her guarded in his safe house while setting in motion his largest attack against the South Korean government.
Watch Now:AmazonWith Son Hyuk becoming increasingly unstable, Athena decides to replace him with another member to lead the organization in another terrorist attack.
Watch Now:AmazonJung Woo, Jae Hee, and Joon Ho form an investigative team to uncover Son Hyuk's past and history with Athena.
Watch Now:AmazonJung Woo faces off with Son Hyuk and his men. Jae Hee arrests Hye In for treason.
Watch Now:AmazonJung Woo continues to question Hye In, but is given a new assignment as a bodyguard. Asian popstar BoA guest stars.
Watch Now:AmazonJung Woo continues to protect BoA. Kwon sends reinforcements to help Jung Woo, Jae Hee, and Joon Ho extract the SNC.
Watch Now:AmazonHaving been found out as being part of Athena, the DIS and NIS hunt down Son Hyuk. Ki Soo tries to decode Dr. Kim's final message.
Watch Now:AmazonA guilty Hye In reevaluates whether she wants to continue being an Athena agent. Jae Hee discovers the shocking truth about her father.
Watch Now:AmazonHye In feels guilty about Sung Chul's death and actively helps NTS bring down Athena. The North Korean government plots to eliminate all former agents, including Kim Sun Hwa.
Watch Now:AmazonKwon heads the NTS team over to Italy to rescue the president's daughter. Son Hyuk receives a special visit from a researcher in Japan.
Watch Now:AmazonLee Jung-woo and Kim Ki-Soo are partnered up to track down a terrorist in Europe and who or what his next target is.
Watch Now:AmazonSon Hyuk takes drastic measures to get Hye In back, as Jung Woo must find additional help to stop him.
Watch Now:AmazonSon Hyuk warns Hye In to get out of Seoul, spurring the NTS to find Son Hyuk before he launches his nuclear missile.
Watch Now:AmazonWith the death of another integral member of NTS, Jung Woo and Son Hyuk have their final showdown.
Watch Now:AmazonNTS and DIS continue their mission to rescue Soo Young. Hye In applies for a new job, while Jae Hee meets with her estranged father.
Watch Now:AmazonA guard catches Hye In hacking the computer system. Kwon suspects NTS has a mole and assigns both Jung Woo and Jae Hee to investigate.
Watch Now:AmazonDespite having betrayed his country, Kwon still believes in Jung Woo and allows him to follow his suspicions about Dr. Kim's last message.
Watch Now:AmazonJung Woo and Hye In's kidnappers want the SNC. Jung Woo agrees to do whatever it takes to save Hye In, as the SIC continues to hunt for the moles.
Watch Now:AmazonLee Jung-woo and the NTS try to hunt down a Russian mob boss who has come to Korea to kidnap Dr. Kim Myung Guk.
Watch Now:AmazonEpisode Ninja is a small business run by one person.
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