Lin Wanyi, an award-winning mediator, travels through time and becomes the newly married principal wife of a marquis's household. Right from the start, she faces a difficult situation: her mother-in-law makes things hard for her at every turn, her husband favors his concubines, and the three concubines engage in daily power struggles. Having seen through the rivalries in the inner household, she has no interest in fighting among themselves and only wants to enjoy a peaceful, comfortable life. She brushes off every provocation and even has a mahjong set specially made so she can invite the three concubines to play every day for amusement. As time passes, those who once fought bitterly learn to live together harmoniously. Her mother-in-law helps her manage household chores, and the concubines willingly attend to her. When the marquis finally returns home, he discovers that he has become the odd one out in his own household and can barely even get a hot meal!