Set against the backdrop of the 1990s, this retro office comedy follows Hong Geum Bo, a no-nonsense financial regulator in her 30s who lives for her work. But when suspicious activity surfaces at a major securities firm, her career takes an unexpected turn. Tasked with uncovering the truth, Geum Bo goes undercover as a 20-year-old high school graduate, diving headfirst into an unfamiliar world of office politics, outdated tech, and hilarious culture clashes.