This is a timeless tale of love, sacrifice, and a promise that spans three lifetimes. Liu Ying, a humble maidservant, unknowingly saves Yuchi Longyan, a thousand-year-old dragon in human form. Grateful for her kindness, he offers to marry her—but a misunderstanding drives them apart.

When another woman, Xia Hou Xue, faces grave danger, Yuchi Longyan vows to protect her for three lifetimes—honoring Liu Ying's final wish. Through the cycles of reincarnation, he silently watches over Liu Ying in each of her lives. Only in her fourth incarnation, as Gu Qing Yan, does she finally become aware of his unwavering presence and the deep love that has endured through time.