During the reign of Wu Zetian, in a secret military camp that existed to revitalize the Li and Tang dynasties, two friends were as close as family members. They have been together day and night for three years, and they care and take care of each other. Gradually, he developed a liking for her. He did not reveal his feelings or seek to be loved. He silently protected her by her side and helped her accomplish what she wanted to do. But she only had one Li Longji in her heart. She worked hard to become stronger for Li Longji and did her best to help him complete his great cause as a monarch. Can she understand his sincerity and live up to his deep affection...