In the future city of Xinhai where memories can be extracted, stored and traded, Lu Chen, the top memory archivist, is a man who has forgotten his past. A commission from the mysterious woman Ling Shuang drags him into a pool of deep water to extract an encrypted final moment from a cold corpse. When he dived into the deep sea of broken memories of the deceased, he unexpectedly recovered his own echoing sound of the lighthouse tide, as well as a sharp pain that penetrated the soul. This is no longer a business, but a dangerous self-exploration. Every fragment of memory may be the key to the truth, or it may be a whirlpool that swallows him completely.
