Jeon Jungkook is an infamous pirate captain who will never stop to get what he wants, and never fails to get it. Kim Taehyung is a merman who has been separated from ever interacting with a normal life, all due to a fearful story that happened in the past. One day, he flees away from the kingdom, only to get captured by Jeon Jungkook. Will Taehyung manage to soften up Jungkook's cruel personality before Jungkook could break him?