Special agent Gu Yanran returns to the country disguised as the eldest daughter of the Gu family. She fights openly for the family fortune while punishing her father, stepmother, and younger stepsister, all while secretly carrying out missions for her organization. Her target is Yu Qisheng. Both have their own agendas, and their clashes are constant, with neither willing to yield. Amid their intense push and pull, they go from adversaries to allies, supporting each other along the way. Before long, Gu Yanran quietly falls in love with Yu Qisheng, beginning an extraordinary story.