In the near future where nanomachines and bionic technology are intertwined, Xia Zhiyu, a survivor of an orphanage fire, makes a living by "repairing damaged dolls", but she does not know that she has already become the core experimental subject of the Ji Group's "immortality plan". The old scar under her collarbone is embedded with the "nano-mechanical shrapnel" she blocked for the wealthy daughter Jihan seven years ago. Every time she sews a label on the AI doll, the temperature of her fingertips is charging energy for the mysterious mechanical empire.
