Lu Qingdai, the female pawn shop owner with the royal bloodline of the former dynasty, runs a small business on the surface, but in fact controls the intelligence network and underground forces across the country. During the day, she battles wits and courage with her enemy, the young minister of Dali Temple, Xie Yunlan. At night, she fights with this sworn enemy who is determined to clean up the court. In the dark side of the court and the rivers and lakes, they jointly fight against the power of the prime minister, and stage a suspense love legend in ancient costumes where "cat and mouse join hands to stir up troubles".
