In the future, humans will live in a "dome" city of absolute rationality and order. To eliminate pain and strife, the "Central" system regularly "formats" negative and useless memories for all citizens. Lin Yan, a seemingly ordinary memory archiver, carries a fatal secret - he cannot be formatted. When he witnesses the person he loves being "corrected" by the system into a stranger, and discovers that deep in his memory lies the original truth that could subvert the entire city, he has to become the only one who remembers the "mistake" in the torrent of forgetfulness. This is a lonely struggle for the remaining humanity and reality in a perfect cage.
