Bai Su, a cold woman with crystal moon soul, keeps the balance of the moon shadow alone, and resists disasters with the mysterious technique of "playing with shadows". When the dark disaster-causing eclipse eroded the southeast moon gap and the world was in danger, Bai Su was misunderstood by the world as the source of the disaster. In a desperate situation, Su Chan was seriously injured and on the verge of disappearing. Looking at the desperate world and the enemies approaching step by step, he was deeply shaken in his heart: Is it worth sacrificing himself? Is the duty of eternal solitude a destiny? ——Whenever the clear light hangs low in the southeast, the flowing light and shadow are her silent watch. A lonely shadow sings its last song, and the beauty of the moon shines on the world forever.