Aman, a girl from a fishing village, discovers traces of a mermaid on the night of the sea festival, and hides the mermaid scales against her ancestors' instructions. This triggers an abnormal reaction from her grandmother, implying that the fishing village hides a secret that has been guarded for generations.
Purpose: At the critical moment of life and death on a stormy night, the mermaid bloodline in Aman's body awakens. Before her death, her grandmother reveals the covenant between the mermaid clan and the fishermen thirty years ago to solve the mystery of Aman's life experience. Facing the awakening behemoth of the deep sea, Aman must make a choice between his mermaid blood and human emotions, and finally uses singing to calm the catastrophe and become a bridge between the two worlds.