In the "Mirror City" where memories are reset by the "Light of Morning" every day, memory restorer Lin Mo's job is to erase any "abnormal" memory afterimages and maintain the perfect order of this utopia. However, when he met Xiao Wan, a girl codenamed "Echo," the fragmentary ravings in her mouth actually awakened fragments of his own deeply buried memories. In order to explore the truth, Lin Mo embarked on a dangerous path that betrayed his responsibilities, but found that he was trapped in a huge maze built by memory, and the exit of the maze may point to a past that he cannot bear.
