Nineteen-year-old Cheng Ye has long lacked exercise and self-care abilities, and his physical condition has gradually deteriorated. After an accident, his family no longer handles everything for him, and sends him to live on an island, cooperating with regular physical examinations to adjust his state. There is no urban convenience on the island, and Cheng Ye learns to take care of his daily life, chopping wood, carrying water, and catching fish, slowly adapting through labor. Island-guarding elder Zhou Shouhai accompanies him, climbing the lighthouse together and experiencing wind and rain, allowing him to understand responsibility and dedication. Three months later, Cheng Ye is brand new, returning to life. Later, the elder leaves the island, but the sound of the tide and the lighthouse are still there. Those truths of labor, choice, and responsibility precipitate into precious imprints in Cheng Ye's growth.