Amnestics do not really disappear, but are encoded into data and stored in the central server of the "eternal mind". 2. Every time a memory is deleted, it will cause small but irreversible damage to the brain. Repeated deletion will lead to personality dissociation. 3. Deleted memories can be "retrospected" by specific equipment and technology, but the process is extremely dangerous. 4. The founder of the "Hippocampus" system has a backdoor that allows him to upload his consciousness to achieve some form of "digital immortality."