Across the Seven Domains, encircled by the Sea of Imaginary Numbers, fragments of the divine cores left behind when the twin gods created the world intertwine with the threat of chaos. Mortal Resonants use contract crests to link divine blood and spirit breath, striking a symphony of coexistence within the rifts. From Wa Lin and A Yun’s quest to uncover the truth behind the divine cores to the new Chordbearers Ha Ke and Su La breaking free of the shackles of divine authority, the story centers on the idea that “resonance means cooperation.” It is not the gods’ order of perfect synchronization, but the courage of mortals to embrace their differences. As the chaos of the Sea of Imaginary Numbers gives rise to threats such as melody parasites and resonance singularities, the people of the domains gradually awaken to the truth: the true law of coexistence lies in the first notes sounded when each soul dares to reach out, weaving an eternal harmony through countless imperfect resonances. This is an epic of fracture and reconstruction, bearing witness to mortals growing from fragments of divine cores into the source of their own resonance.