Dong Ju gets the National Tax Service to investigate his father's case; he persuades Director In to let him join the NTS, and Director In decides to send him to Bureau Five, a special bureau that handles the hardest cases.

Dong Ju makes a big first impression by tracking down one million dollars; however, Chief Oh doesn't like the way he works; the team gets a tip about Oz Foods' tax evasion.

Dong Ju exposes someone inside NTS.

Young learns about Dong Ju's father and Tae Jun's connection; he thinks that Dong Ju is trying to get on Tae Jun's side; Dong Ju looks for the car related to his father's death.

Out of many candidates, Young is chosen as the Chief of Bureau Five, but he remains wary of Dong Ju's intentions; as Dong Ju and Hye Young look into Gold Cash, they uncover a pattern of assault cases with its debtors; Young confronts Dong Ju.

Chief Lee pressures Dong Ju to cover up the Gold Cash case; Bureau Five decides to carry on with the investigation despite the various attempts from others to throw them off; they find a strange connection between Gold Cash and a car wash company.