In the future city "Micheng" invaded by "amnesia", citizens rely on "memory beacons" implanted in the brain to maintain their identity and emotions. Lin Su, a top memory restorer, repairs the broken memories of others day after day in order to save his terminally ill sister. However, his peaceful world is turned upside down when he discovers an unusual data stream that cannot be deciphered in his sister's beacon. Following the clues, he broke into the shadow area of the city and met the mysterious "memory wanderer" - Nightingale. She claimed that the memory beacon system that was regarded as a standard was nothing more than a carefully woven cage of lies. Lin Su is forced to make a choice between protection and the truth, and every step of his exploration awakens the city's sleeping secrets and a dangerous truth that can subvert the entire civilization.
