Agency follows the career of Go A-In (Lee Bo-Young) as she works from the bottom to the highest position in an advertising agency. Go A-In comes from a poor family background and she didn’t graduate from a prestigious university, but she has a strong desire for success. She works at an advertising agency. She is known at work as a person who only cares about success and money. With her dedication to hard work and desire for success, she works her from the bottom and strives to become the first female lead executive at a major advertising agency.