An elite matchmaking company, 3%, where only the upper class gather with wealth, looks, and perfect credentials. Yet love never follows formulas. In front of Yoon-jin, a perfectionist CEO who believes only perfection matters, appears Sun-woo, a new secretary rated “D” in looks. At first, Yoon-jin refuses to acknowledge her, but Sun-woo’s sincerity and warmth begin to shake her beliefs. A sweet yet dangerous romance begins between a perfectionist boss and a secretary who reads people’s hearts.