The heroine Liu Qingge senses the call from her past life and returns to the time and space of her previous life, and marries King Huai Xiahou Xuan in place of her second sister. However, the beautiful second sister enters the palace and becomes a beloved concubine. As the brother of a general and a powerful father, he seems calm but has a turbulent undercurrent. The emperor of the enemy country Yun Qi, the princess of the enemy country Yunyao who is both an enemy and a friend... Can the erased memory be recovered? Every step of the conspiracy, every dream and prayer, the love has always been deep but the fate is shallow.