In the near future where memories can be accurately deleted, architect Lin Mo chose "amnesia" surgery to get rid of the pain of losing his wife. However, two years later, a recurring mysterious key and lingering "phantom senses" broke his stagnant life. He was forced to return to the "No Memory Society" and explore the truth with the calm and contradictory Dr. Chen, the leader of the operation. They discovered that the deleted memories did not disappear, but fragmented into isolated islands in the deep sea. In order to retrieve the last message left by his wife, Lin Mo must dive into the sea of oblivion created by himself and salvage the truth that he abandoned but defined his entire life. This is not only a reorganization of memory, but also a redemption of the soul.
