The series follows Cha Ji-yoon, a seventh-year product planner who is completely burned out by corporate life and stuck in a career and romantic slump. She lives for efficiency, deadlines, and the simple joy of clocking out precisely on time.

Her structured, quiet existence is shaken up when she is forced into a task force led by Kang Si-woo—the company's most notorious and prickly department manager, known for his strict discipline and blunt communication style. As Ji-yoon chooses her difficult boss as the "lesser evil" to avoid worse assignments, the two slowly discover the kinder sides of one another, forming an unexpected and irreplaceable bond amidst the chaos of office life.