After years of planning, a young accountant takes a job as a team leader at the National Tax Service (NTS). His goal is to find the powerful people who were responsible for his father’s mysterious death and see them all pay for their crimes.
Hwang Dong-joo joins National Tax Service after his father's death, assigned to 5th Bureau of Taxation. Seeks justice in his own way.
Dong-joo recovers slush funds from Yang, conflicts with Hye-young and Oh Young. Pursues "Myeong-ju Electric" case linked to his father's death.
Dong-joo and team investigate tax evasion by Oz Foods and internal officials colluding with them at National Tax Service.
Director In Tae-joon and PQ Group involved in Oz Food's corruption. Dong-joo challenges Director In Tae-joon's power.
Oh Young nominated for director; debate ensues due to past case. Dong-joo investigates illegal loan company Gold Cash.
Lee Ki-dong pressures Dong-joo to cover up Gold Cash case. Internal pressure on 5th Bureau intensifies.
Dong-joo suspended, team disappointed to learn about loan from Gold Cash. Investigation transferred to 3rd Bureau.
Dong-joo uncovers bond between Gold Cash and 4th Bureau, pressures Lee Ki-dong. Tae-jun intervenes, 4th Bureau regains control.
Dong-joo pressures Lee Ki-dong for truth about father's death. Prosecution investigates collusion between Sanjo Bank and Gold Cash.
Informant disappears, blamed for loan corruption. Dong-joo searches for informant, investigation halted.
Hye-young wanders after learning truth about past case. Dong-joo protects her, Oh Young reveals corruption.
Dong-joo and Oh Young grapple with corruption report, potential trap set by Tae-jun.
Unexpected truth surfaces, Dong-joo wanders. Crisis due to Jaesong Construction's bankruptcy.
Dong-joo pressures Tae-jun for answers about father's death.
Crisis deepens with informant's death, false accusations against Dong-joo.
Tae-jun exploits bankruptcy to dissolve 5th Bureau, push for Commissioner's resignation.
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