Hidden Identity - Season 1

Investigation team 5 is on a mission to gain information about a product Teacher Jung is buying. Cha Gun Woo blames himself for losing his partner on a mission and seeks revenge....

Cha Gun Woo successfully infiltrate Teacher Jung's his criminal organization, even though 100 Percent is convinced that he is a cop. Is he able to discover their plans and find the whereabouts of Min Tae In?

Teacher Jung's plan is set in motion with Investigation 5 tailing him, but both plans aren't going according to plan.

Teacher Jung has been caught and brought in for interrogation. Soon after, they find a new clue to continue their hunt for Ghost.

When the bomb is defused and both criminals are death, they have to create a new plan which brings them into a human trafficking business.

When Cha Gun Woo is released, Prosecutor Park Min Young starts to dig into Jang Moo Won's activities. In order to try to win her favour, he commands his team to find information regarding a case from 10 year ago.

Jang Moo Won has been arrested, while his team continues to find that videotape of Yeon Soo's raping. When prisoners are trying to kill Nam In Ho, he decides to talk to Investigation Team 5 to reveal details about ghost in order for protection, but will Cha Gun Woo be able to control his emotions?

When Ghost his plan to free Nam In Ho is a success, Gun Woo goes rogue when Jang Moo Won decides to take a step back in order to save lives.

Cha Gun Woo goes rogue to get his revenge on Nam In Ho, while Investigation Team 5 is hunting him down.

When Jang Moo Won takes responsibility for Cha Gun Woo's actions, Police Commissioner Lee Il Han gives them one month to catch 'Ghost' before they are decommissioned.

When Nam In Ho is being killed, Investigation Team Five finds a new lead which may bring them very close to 'Ghost'.

The team prepares to discover Ghost his identity amongst the list of 15 VIPs with some surprising names, but catching him is not that easy as he seems to always be one move ahead of Jang and his team

Min Tae In has been kidnapped by Ghost as he is the carrier of VD107, while Jang and his team are hunting down the creator of this specific virus to find antibodies.

When every clue leads to Director Choi Dae Han and Chairman Lee, an impossible task is given to Jang Min Joo to reconnect with her father after twelve years.

While all puzzle pieces are coming together to Jang and his team, Gun Woo suffers a major blow again.

When Jung Sang Joon takes over control, Investigation Team Five has to do their utter best to prevent them from spreading the VD108 virus at all costs.