In the turbulent inner courtyard of Prince Yong's Mansion in the last years of Kangxi, the modern social beast Jiang Suiwan died suddenly and transformed into the most inconspicuous little princess. He originally wanted to save money and run away by "lying down and learning", but unexpectedly set off a "pragmatism" in the backyard with modern skills such as a small take-out kitchen, handmade anti-heat patches, and clock repair. The cold-faced Fourth Master Yinzhen initially only regarded her as a strange person in the house, but later he was quietly moved by her life philosophy of enjoying life without fighting or grabbing, and forced her to be the "accounting lady". From checking accounts and books to jointly managing household affairs, from daily necessities to undercurrents in the court, the two gradually fell in love amidst the laughter, curses, and crises. When the storm of seizing the rightful son in Kowloon swept across, she used modern wisdom to help him secure his position, while he used the respect of an emperor to protect her peace and tranquility throughout the years - a light comedy time-travel love song that started from lying down and ended with deep affection, warmly staged under the red wall of the Forbidden City.