What secrets is the family guarding? The boundary between yin and yang, the intertwining of love and hate, the mission that continues for thousands of years. Different paths, but the same destination. To fuse his two souls, he has to make a choice: who will die and who will live? Is the man who only appears at night real or illusory? Many years later, when he traveled across the three realms with a jade flute, he realized that everything was fate...