In order to survive, a merchant's daughter went into the palace incognito and became a slave. With her meticulous accounting skills and forbearance, she worked step by step in the turbulent chess game of seizing the inheritance. She and the seventh prince who pretended to be sick and weak took advantage of each other and depended on each other for life and death. In the end, she uncovered the palace's big lie, helped Mingjun ascend the throne, and found a counterattack path of self and true love.
