Ning Xin and Lu Yunjian were childhood sweethearts, developing secret affections amidst childhood bickering. However, due to imperial power struggles, she mistakenly became the former crown prince's fiancee. After seizing the throne, Lu Yunjian brought her into the inner palace but delayed summoning her, making her mistakenly believe she was merely an enemy. When the truth was unveiled, the former youth and maiden finally faced their true feelings, going from enemies to deeply loved ones, hand in hand spending the rest of their lives together. A childhood romance from estrangement to guarding one another, sweet yet bitter, ultimately becoming a legendary tale.