Haeseo is profoundly touched when Taegun, the little boy he rescued long ago, returns to the shore where they initially met as an adult. Although Haeseo meets Taegun again in his human form, an error discloses the reality that Haeseo is, in fact, a mermaid to Taegun, and gradually, Taegun's intense obsession begins to surface. "If love between a mermaid and a human is not genuine, the mermaid will vanish into the seafoam." As Haeseo's uncertainty about Taegun's feelings increases, he comes to understand the curse that has been cast upon him.