In the future city "Aethelburg" where memories can be quantified, stored and erased, Lin Jian is a top memory archivist. His job is to organize the "memory echoes" of the deceased and archive them for history. His life is like an isolated island that has been precisely planned, calm and without waves. Until one day, in an echo of an unknown person, he saw a scene that did not belong to any file - a rainy night, a rusty iron door, and a woman's face that made his heart stop. This fragmented memory, like a rock thrown into the sea of oblivion, aroused his fatal desire to pursue the truth and made him question his "set" life.
