Ye Lingshuang, a young girl from the grassland, is regarded as a disaster star by her tribe because she can predict disasters. Only Qi Hairui, the princess of Yebei, treats her like a sister. Yebei overestimates its own strength and goes to war with Da Chao. The army is defeated and about to die. Ye Lingshuang is also taken as a female prisoner and taken to the Jiaofangsi. However, she does not give in. With her talent for astrology, she enters the Imperial Observatory as an official and gradually enters the heart of the iron-blooded emperor Yu Xiuming. However, just when their friendship is gradually deepening, Ye Lingshuang learns of Qi Hairui's death and breaks up with Yu Xiuming. Ye Lingshuang is determined to save Qi Hairui and reverse time. She returns to the old Yebei. Can she change what has happened? Where will her relationship with Yu Xiuming go...