In the near future, "memory reconstruction technology" will be available, which can repair damaged memories through neural interfaces, and can also modify and implant false memories. It was initially used to treat post-traumatic stress disorder, but was later abused by the underground market. The protagonist Lin Mo is one of the early developers of this technology, but he lost nearly five years of memory due to an "accident". People around him told him that he had given up research and lived in seclusion due to an experimental accident that led to the death of his assistant.
