The main character, Young-eun, lives with her mother, a haenyo diver, in a fishing village on Jeju Island. She learns eco-friendly photography from her friend Seung-hwan, who is a beachcomber. One day, her mother gets caught in a discarded net submerged in the sea and drowns. Young-eun moves away from Jeju and returns two years later for her mother’s death anniversary. She decides to begin taking pictures of sea debris on beaches, and Seung-hwan leaves the island to find a giant floating trash island in the Pacific Ocean on a boat made of recycled materials.