By chance, he rescues an injured mermaid noblewoman who has lost consciousness on the shore, and through a twist of fate, brings her into the city to live among humans. After finally adapting to their new life, the two fall deeply in love. But before their happy life can even begin, she is swept into a political coup and conspiracy in the mermaid world. What will become of their love? Will they leave together, or part ways in the jianghu?
