In a future city where memories can be safely stripped away, Lin Feng is a "memory ferryman" who specializes in erasing the painful past for clients. He is calm and professional, turning other people's pain into cold chips, but he is still unable to get rid of the shadow in his own heart. Once, he received a mysterious old woman who asked to have all her memories erased. During the operation, a memory fragment that did not belong to her and was full of violence and fear accidentally invaded Lin Feng's mind. This dangerous "isolated island" memory dragged him into a vast ocean called "forgotten", forcing him to explore the truth of a crime that had been covered up for many years, and the end of the clue actually pointed to his own long-gone past.
