On the coast of the East China Sea, in search of her missing father, A-Lin, a pearl diver, broke into the Black Coral Forest of the Dragon Palace, a legendary forbidden sea area, against her ancestral precepts. This dark and deep coral forest will emit a soul-shaking "weeping sound" every full moon tide. A-Ling witnessed with her own eyes the fragility of the dragons under the sound of weeping tides: their tyrannical scales peeled off, turning into helpless fish. And strangely, this sound that caused pain to the dragon clan has become the patron saint of fishing boats on the sea, able to calm storms and guide those who are lost in navigation.