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 leave records about the queen's palace, which male historians have traditionally been forbidden to enter, an unprecedented examination is held to select female historians. They must be outspoken and fearless in their honesty. No one, not even the king, 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 that the brush is more powerful than the sword.