The story explores the origins of the former Director of the NSS and IRIS agent Baek San and the protagonist Jung Yoo Gun. After agent Kim Hyun Jun was killed by a sniper shot from IRIS agent Ray, IRIS went into remission to recover and reconnoiter. Three years have since passed and NSS is no longer a secret black-ops division as it once was; it is now a public entity to the world. However, the National Security director, who became NSS's oversight reduced the organization's abilities and limited it to regulating and controlling federal crime, like shutting down an arms smuggling ring. It is during that time that the current director of NSS takes note of Officer Jung Yoo Gun and has him train a new group of NSS agents to manage future national threats. (Source: Wikipedia)