Shin Cha-il joins JU Construction's Audit Team as the new head. After meeting the team, he has nothing more to say than to ridicule their incompetence and laziness. Cha-il begins reinvestigating a tower crane accident already closed to audit and visits the construction site. When he suspects evidence of corruption on the foreman's laptop, the foreman attempts to run away.

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.