Lin Xia, a consciousness engineer who can "cut" the light and shadow of memory, accidentally discovered the erased mark of resistance while restoring her mother's digital portrait. When the memory of her loved ones was reduced to a commercial puppet, she used her diary as a blade and emotions as an anchor to piece together the tampered truth in the torrent of data. She wants to prove that true immortality is the integrity of the soul. This is a battle of light and shadow fighting for the right to "existence" for the mother and for millions of digital souls.