Hidden Identity

After his partner is killed, Gun Woo joins the elite undercover unit the Criminal Investigation Team and goes deep undercover to recover an old friend.

Though Gun Woo is suspected of being a cop, the gang brings him along on a job. The Criminal Investigation Team finds Hae imprisoned by the gang, but he insists on staying to complete the mission.

Min Tae In finds a way to extract himself and prove Gun Woo's loyalty. Complications ensue as as the criminals attempt to steal the hologram.

Gun Woo officially joins the team and puts his investigation skills to use as they track a hacker known as the Mermaid.

The team discovers a human trafficking ring and Assistant Manager Jang goes undercover, but gets kidnapped in action.

Sore that the Team is closing their cases faster, the National Intelligence Service hires an attorney to investigate them. To fight back, Min goes undercover in their agency and the team tries to solve an old case.

When the Ghost's associate is attacked in prison, the team uses the victim to get closer to the Ghost.

The team raids a foreign consulate to track down a a chemical weapons manufacturer, but when this takes them away from their mission to capture The Ghost, one member goes rogue.

After Gun Woo betrays the team, he attempts to infiltrate the criminals selling the VD107 virus. Is he acting out of revenge or for the good of the team?

Gun Woo's rebellion puts the entire team's existence in jeopardy. The team stages a fake torture scenario to find Nam In Ho.

Assistant Manager Jang goes undercover to investigate a corrupt charity, while the teams follows the money to get closer to the Ghost.

The team observes a meeting where the Ghost is suspected to finally show up. Meanwhile a team member falls into a deadly trap.

With Min Tae In infected with the VD107 virus, the team works with the National Intelligence Service has to find a biochemist to cure him.

With Director Choi revealed as the Ghost, more players in the conspiracy are uncovered. Assistant Manager Jang's past is revealed.

The truth about the Ghost and all the criminals the team encountered is revealed. The team races the clock to find where they are hiding.

Director Choi threatens Seoul with the VD108 forcing Team Leader Jang to meet his demands. Meanwhile, the team searches to find and disarm the bombs.