Cha-il investigates a 3.4-million-dollars embezzlement case from a housing project and investigates Mi-kyung, the head of the Housing Team, who is his college junior. As the investigation progresses, a sexual harassment scandal occurs between them, putting the embezzlement case in turmoil. However, when Cha-il thinks he's solved the case, Hwang Dae-woong stands in his way.

Cha-il tells Dae-woong that he will take responsibility and recover the embezzled money, but Dae-woong gives Cha-il an absurd condition for his promise. He tells him if he doesn't recover the money, he will have to resign and pay back the missing 3.4 million dollars. However, Cha-il still accepts the condition. Meanwhile, the Audit Team locates the money and arrives at its location.

A letter exposing the corruption behind the on-site restaurants arrives at Cha-il's desk, and a food poisoning case arises at the shopping mall construction site's on-site restaurant. After urgently shutting down the JU Construction cafeteria and on-site restaurants, the Audit Team investigates corruption behind the selection process of the on-site restaurants. However, the Audit Team struggles to find clear evidence and faces Da-woong's opposition.