In the near future city of Xincui City, Lin Chen, an elite memory cleaner, makes a living by erasing the pain of others. He is calm and professional and firmly believes that forgetting is the best salvation. However, a mysterious client brings an unprecedented commission to delete a very beautiful memory. When Lin Chen dived into this memory, he found that the laughter of the woman in the white dress in the garden under the sun had a strange resonance with his dusty past. Fragments of memory begin to erode his reality, forcing him to question his beliefs and identity. On this island built of data and forgetfulness, he must find the truth, otherwise he will be completely swallowed by the deep sea called the past.