Ten years ago, Dingnan Marquis Fuliantian, his wife and their young daughter Fu Yunxi died tragically, leaving Fu Yunyuan and Fu Yunyu alone to depend on each other. However, in an accident, Fu Yunyu was poisoned. With the appearance of the mysterious girl Gu Zhiyi, although Fu Yunyu was cured of the poison, Gu Zhiyi's identity became increasingly suspicious. Who is Gu Zhiyi? With the appearance of her senior brother Mu Ci, the thick fog dispersed~