With the improvement of scientific and technological level, human immortality has been realized from another level.
The mental power is compressed into an extremely precise energy body, artificially put into the "cleaner", and the memory is extracted and sealed in a chip. Take human tissue for culture, re-create a replica, invest mental power and memory chips, and wake it up after a running-in period, thereby achieving the goal of immortality. This technology is still being tested. The Federation only selected volunteers and prisoners from the legion, screened out those with mental strength of Grade A, put them into the "cleaner", and successfully awakened the first "immortal" in stardate 9124.
Later generations called it——the reincarnation plan.
Cp Han Yi × Luo Qingyan
I put myself in the darkness in exchange for your light. I used pain as salvation to travel through the dark night, giving you the loneliest protection. You turned back silently, but I closed my eyes. I'm not afraid of the dark.
——Keigo Higashino's "White Night Journey"
Concept: sweet love