Three hundred years ago, Shen Qingxian, the leader of the Immortal Sect and gifted with a sword bone, sacrificed his body to the sword in order to suppress the World-Destroying Demon Lord. His soul was shattered and scattered across the nine heavens. Three hundred years later, in an abandoned mortal city, an amnesiac girl named Ah Jiu awakened from an inexplicable power in her body and was drawn into the whirlpool of immortality and demonism. She has powerful sword energy, but she doesn't know how to control it. She is like a child carrying a jade walking in troubled times. In order to find her own life experience and to escape the pursuit of fate, she embarked on the road of inquiry.
During the journey, she met the gentle and thoughtful Young Master of the Immortal Alliance, and also reunited with the Demon Lord who was inextricably linked to her and was both her enemy and her only confidant. The fragments of memory were pieced together in life and death tests, and Ah Jiu gradually discovered that his identity was far more than what he appeared to be. When the name "Shen Qingxian" reappeared in the world, and when the dust-laden truth was revealed, she realized that the attempt to suppress the demon three hundred years ago was actually a well-planned scam. This time, she wants to live for herself. What Jianfeng points to is the hypocritical way of heaven and that unforgettable past.