Wang Ruiqiu, a fearless Jianghu heroine, accidentally ends up in the palace and takes the place of the bride, throwing the cunning prince's wedding and his elaborate plan to catch a thief into chaos. Unable to escape, she reluctantly assumes the role of princess and plays along with the prince's scheme. As they clash and outsmart each other, their growing connection leads them to join forces, unraveling dangerous conspiracies together.

江湖侠女王瑞秋（辛悦 饰）误入王府，替换新娘，搅乱了腹黑王爷崇六（左叶 饰）的新婚和潜心设计的捉贼大计，跑路不成的王瑞秋只能顶着王妃的身份配合王爷演出，两人斗智斗勇最终日久生情，携手共破阴谋诡计。