Prince Qi, Xiao Huaijing, burdened with a special mission, has cautiously hidden her identity for years, wholeheartedly assisting her young younger brother in safeguarding the imperial court. The cold-faced general, Xie Linzhou, crosses paths with her once again due to an unexpected accident, and the two go from probing each other to trusting one another as they jointly protect their home and country. Facing border tensions and people's livelihood difficulties, Xiao Huaijing uses her wisdom to promote border markets and resolve crises, while Xie Linzhou lets go of fame and fortune, steadfastly guarding her and her family. When secrets gradually come to light, they make their choices with responsibility and sincere hearts, jointly welcoming a stable and warm new life and guarding the tomorrow the common people hope for.