The waters surrounding the island of Korena are said to be home to a group of mermaids, that lurer every boat that leaves the shore into crashing. What happens when the brothers of Korena, Prince Taehyung and Prince Jungkook, fail to believe the warnings they hear and attempt to sail out onto the water to ease the nerves of their people? What happens when the mermaids lurer them into crashing their ship and attack the men on board? What happens when one of the mermaids convinces her sister into taking pity on the Prince brothers and they bring the two onto the nearby shore?