Kim Sung-ryong is an exceptionally brilliant accountant with a deeply shady moral compass, operating in Gunsan as the resident tax man for local gangsters. Adept at skimming money undetected, Sung-ryong dreams of embezzling a massive fortune so he can permanently retire to Denmark. Seeking a massive payday, he applies for and surprisingly lands a position as the Chief of the Business Operations Department at TQ Group, a sprawling, corrupt South Korean conglomerate. Initially, Sung-ryong’s sole motivation is to exploit corporate vulnerabilities, manipulate internal accounts, and siphon off millions.However, his grand plans are continuously derailed. TQ Group is a snake pit of corporate malfeasance, currently orchestrating a brutal restructuring plan designed to lay off hundreds of innocent workers while covering up massive embezzlement by executive elites. Sung-ryong inadvertently crosses paths with Yoon Ha-kyung, a fiercely principled
assistant manager determined to expose the company's corruption, and Seo Yool, a ruthless, ambitious prosecutor-turned-corporate director who was specifically hired by the corrupt chairman to clean the books through intimidation and illegal firings.Instead of smoothly executing his embezzlement scheme, Sung-ryong finds himself repeatedly clashing with Yool's oppressive management tactics. Driven by a volatile mix of self-preservation, petty spite, and a newly awakened, deeply buried sense of justice, Sung-ryong begins staging elaborate, highly entertaining acts of corporate sabotage. Rather than stealing from the company for himself, he finds himself accidentally saving the Business Operations Department from destruction and becoming an unlikely champion for the abused rank-and-file employees.As the series progresses, the cat-and-mouse game between Sung-ryong and Director Yool intensifies into an all-out corporate war. Sung-ryong transforms from a self-serving rogue into a strategic mastermind who unites the fragmented departments of TQ Group. Alongside Ha-kyung and a reformed Yool—who eventually turns against the corrupt chairman after realizing he is merely a disposable scapegoat—Sung-ryong exposes offshore accounts, leaked slush funds, and
human rights violations. Through a series of brilliant undercover stings, public whistleblowing, and courtroom showdowns, the once-selfish accountant successfully brings down the conglomerate’s corrupt leadership, restores justice to the employees, and ultimately chooses to walk away from corporate life entirely, maintaining his chaotic yet noble integrity.