Seong-ryong is a slick accountant who keep mobsters' money safe from the authorities. But he also skims money, and that annoys the boss. So, he takes a job at TQ where the Manager, a whistle blower, is under a cloud and is hospitalized.
Sung Ryong begins his new job at TQ Group, but receives a chilly reception from his department. Prosecutor Yool also takes a new position and plans to use Sung Ryong for his own ends.
Sung Ryong has earned a new upstanding reputation by his accidental action, but his department still isn't convinced. Ha Kyung suspects the driver of being involved in something bigger, but is unable to find evidence.
The handling of the union strike causes Chariman Park to order Sung Ryong to be fired. Yool finds out that Ha Kyung and Madam Jang are working together.
Sung Ryong is as disruptive as possible while threatening to expose the company to the press. Ki Ok worries about his father when the labor union protestors are arrested.
Business Operations begins work on a revival plan that has higher stakes than they expected. The higher-ups involved in illegal activity scramble to get rid of evidence.
Sung Ryong is overcome with guilt after the failure of his plan, but his coworkers, now in new departments, stay positive while striking back at those who wronged them.
Sung Ryong helps rally young store employees to sue TQ Group and finding evidence of corruption. Prosecutor Kim discovers Ga Eun has been disobeying orders.
A traumatic experience scares Sung Ryong, but he vows to get revenge anyway. TQ Group's audit approaches, so the accounting team works to cover up their fraud.
Sung Ryong tries to figure out how to rescue Yool from the detention center while pressuring higher-ups to confess what they know about TQ Group's crimes.
Even though Chairman Park has been arrested, he tries to cover his tracks by bribery. As TQ Group faces bankruptcy, Sung Ryong and his team try to figure out a solution.
