A mermaid appeared in the blue waters of Jeju Island. Due to global warming, the tides have become irregular, trapping the mermaid on the shore. Soon, the mermaid is discovered by the villagers. However, unlike the image in human imagination, the mermaid's appearance seems somehow off. Five men—the village chief, the owner of a seafood restaurant, a politician, a YouTuber, and a university researcher—each with their own ulterior motives, approach the mermaid. Will she be able to escape safely?