No outsider has ever set foot in this mythical land, but its spirit-like dwellers are well acquainted with mortals. These entities are responsible for human emotions and desires, as well as the changes in weather, seasons, and the passage of time. Chun, a spirit girl who has just turned sixteen, transforms into a dolphin and explores the earthly part of the sea to learn about humanity. Caught in a storm, she becomes entangled in a fishing net and is rescued by a human boy. Tragically, the boy drowns in the process, leaving Chun heartbroken. Da Hai is a poignant tale of sacrifice and redemption, as Chun embarks on a mission to revive the boy's soul, now in the form of a little white fish. The story explores the struggles of adolescence, limited power, and the complexity of emotions such as love and loss with sensitivity and depth.