A Crown Princess, Zhang Ruyi, ascended the throne after Emperor Zhang Luo died. Haunted by the palace Hunger Games, she spent her life on the battlefield and disguised as a male. At first, the Imperial General doesn't allow her to join the military but due to her strong determination, he finally accepts the Crown Princess. Amazed by the Crown Princess's military skills, he then let the Crown Princess join any war.
Women are not allowed to be a ruler. Since the Crown Prince died, the Emperor doesn't have any choice but to make his only daughter the next Emperor. To break the rules, he created a knockout game between his son (Not the Crown Prince) and his daughter. The winner will take the throne.
Successfully ascending the throne and discarding the palace rules, Zhang Ruyi becomes the new Emperor with her own rules. She doesn't want to be like her father.
Known as a bright ruler, but naive in love relationships.
Forced to marry a Crown Princess, it gives a hard hit on her chest. For Zhang Ruyi, it is her dead end. As time goes by, the Crown Princess slowly heals the wounds inside Zhang Ruyi's heart. Without realising it, she (Zhang Ruyi) slowly creates a feeling towards the Crown Princess.