Kim Hyeon-Jun and Jin Sa-Woo found themselves captivated by the same woman, who had simultaneously selected them as recruits for a clandestine counter-terrorism unit.

As a trial run, Hyun Joon and Sa Woo were tasked with preventing an impending plot to assassinate the South Korean President.

Having secured the President’s safety, Kim Hyun Joon, Choi Seung Hee, and Jin Sa Woo were each awarded a period of leave. However, Sa Woo's respite was abruptly curtailed when he received orders to extract a nuclear specialist held captive …

Hyun Joon received a solitary mission: to eliminate a North Korean minister. Yet, carrying out this task risked transforming him from hunter into prey.

Hyun Joon finds himself implicated in espionage, and now faces pursuit from three separate agencies: the North Korean Security Service, the Hungarian police, and the NSS.

Six months had passed since Hyeon Jun was presumed lost, when North Korea discovered he was alive and residing in Japan. Park Chul Young then dispatched Kim Seon Hwa to pursue him.

Convinced that Seon-Hwa holds the key to finding Hyun-Jun, Seung-Hee follows her back to Japan. Unbeknownst to them both, Hyun-Jun himself is now a target, relentlessly pursued by agents of Japan’s National Intelligence Office.

A shadowy figure has relentlessly pursued Hyun-Jun, driven by a USB drive left to him by the recently deceased Hong Seung Ryong. The device contains details concerning a clandestine terrorist group known only as IRIS.

Driven by a thirst for retribution against the NSS, Kim Hyun-Jun sought out Park Cheol-Yeong’s assistance. Yet, Cheol-Yeong would offer his aid only under one condition: that Hyun-Jun participate in devising a plan to eliminate a North Kore…

To distract the NSS, Hyun-Jun and Cheol-Yeong’s people engineered a deliberate diversion, allowing them to infiltrate the NSS headquarters unnoticed.

It was only now that Hyun-Jun learned Seung-Hee lived. He fled NSS alongside the terrorists, carrying a vital component of a nuclear weapon. As a consequence of this shared escape, Hyun-Jun had unexpectedly earned Park Cheol-Yeong’s confide…

Driven by a need to understand both IRIS and the truth surrounding his parents, Hyun-Jun reaches out to the enigmatic figure who had once saved his life in Hungary. Meanwhile, Seong-Hee’s relentless pursuit of Hyun-Jun has resurfaced, drawi…

Seung-Hee and Hyun-Jun found themselves together once more. Yet, the terrorists compelled Hyun-Jun to question her, demanding information. Simultaneously, news broke publicly: the terrorists intended to detonate a nuclear weapon over Seoul …

A shadow of doubt now falls on Sa-Woo and Baek San; Park Sang-Hyeon and Seung-Hee are beginning to suspect them of disloyalty. Simultaneously, Park Cheol-Yeong finds himself questioning the necessity of a nuclear strike. Elsewhere, Hyun-Jun…

Park Cheol-Yeong aligns himself with Hyun-Jun and a shadowy group in a desperate effort to thwart the impending terror attack on Seoul. Their immediate priority, however, lies in locating the device itself. Simultaneously, IRIS is steadily …

The President has issued an order for Young Ki Eun’s arrest. However, upon his sudden death, the President then commands the arrests of Sa Woo and Baek San. Simultaneously, Hyun-Jun, Seon-Hwa, and Cheol-Yeong race against time to find the n…

The threat of the terrorist attack has subsided, and a sense of hope is returning. Baek San and Sa-Woo remain in custody, while Hyun-Jun and Seung-Hee have been reunited. Now, the focus shifts to locating those connected to IRIS whose names…

News concerning the locations of Baek San and Sa-Woo has surfaced within the NSS. Yang Mi-Jeong is now confirmed dead. IRIS is preparing an assault on the South Korean President. And Seon-Hwa suspects that Seung-Hee may also be in danger, m…

Hyun-Jun located the IRIS headquarters and apprehended Baek San, yet Sa-Woo remains unaccounted for. The NSS works to determine the location of IRIS’s impending strike. Simultaneously, Hyun-Jun uncovers evidence suggesting that Seung-Hee is…

Hyun-Jun and the NSS managed to secure the release of the hostages, though at the devastating price of Sa-Woo’s life. Yet, on the very night of the planned summit, a startling message reached the NSS: the individuals they had rescued were n…