In the early 19th century of the Joseon Dynasty, everyone is stuck in their ways, clinging to the old ways, until something incredible happens. To keep records of the Queen's palace, which has traditionally been off limits to male historians, an unprecedented exam is held to select female historians. They must be outspoken and fearless in their honesty. No one, not even the monarch, can speak to anyone in private without the presence of a historian. These historians are not beholden to any official, but will female historians have such autonomy? This series tells the love story of Yi Rim, second in line to the throne, and Goo Hae-ryung, a female historian who believes the brush is more powerful than the sword.