The Kingdom of Keeping the Covenant and the Kingdom of Linyue have been at war for many years, and the people have suffered terribly. The general of the Promise-Keeping Country died in battle, and asked his daughter Zhou You to guard the Promise-Keeping Country in his place, making her swear an oath that Zhou You would not die and that the promise would never be destroyed.
Zhou You once again guarded the border. At this time, the national treasury was empty and gradually declining. Just as the new emperor of Linyue Kingdom, Meng Pei, ascended the throne, he quickly controlled the civil strife and prepared to attack the country that kept the treaty.
At this time, Zhou You decided to take a dangerous approach and let go of his gentle and kind-hearted fiancé Mu Chun, marrying Meng Pei instead of the fifth princess, and secretly assassinated her.
Unexpectedly, the gentle Mu Chun, whom he has known for more than ten years, is actually played by the murderous Meng Pei.
The two lovers broke up, and the gears of fate began to turn again.
Philosophy: The heroine Zhou You is responsible for the world. Her father made her swear an oath from an early age that Zhou You will not die and will keep her promise. After experiencing the betrayal of his lover and the abandonment of his country, he never gave up, turned the tide, saved the country, and gradually grew up.