Ryeowook, a ten year old boy currently living in London in the year 1945, goes on a train trip. When the train stops to have a break, he runs off into a field with a rabbit hole. What he didn't know is that the rabbit hole was a  pathway to a magical place with a stunning seaside. He meets the most beautiful boy (who is also a turtle) whom he falls in love with, but he must go back to his family. He must wait for the right time so Yesung can take him back to the human world but it isn't as simple as that. An evil man wants to take Ryeowook and keep him as a pet. Will he ever be able to make it home? But another part of him wants to stay with Yesung because he loves him. What will he decide?