Xiaoya, an orphaned girl from a fishing village, goes out to sea to haul in her nets and unexpectedly catches a baby merfolk playing in the water. The little one becomes trapped in the net and weakly cries for help. Later, Xiaoya falls into the deep sea, where a powerful breath enters her mouth and revives her. When she opens her eyes, she sees the Ah Hai she has been longing for. Despair fades away, replaced by overwhelming joy, as the two embrace in the deep sea, surrounded by the glow of their fish-scale markings. Their fateful reunion leaves endless suspense.