Love Across Past and Present, Lasting a Thousand Years

She is a descendant of the Nuwa clan, bearing the mission of protecting the land from the moment she is born. He is the supreme ruler of the demon realm. After an unexpected encounter, they come to know and love each other, and swear an oath to last a thousand years. When disaster strikes the land and the inner demon appears, darkness spreads across the world. To protect the land, she dies alongside the demon. The inner demon vanishes, and her soul enters the tunnel of reincarnation to be reborn. A thousand years later, memories of her past life surge into her mind. Can he and she still love and understand each other as they did a thousand years ago?