The cold weapon master Shi Yan mistook the exiled prince Qi Jin for an ordinary homeless man and repaired his prosthetic limb, but accidentally activated the imperial forbidden star core resonance. When the imperial pursuers and mysterious rebels targeted her at the same time, she realized that what she had saved was not a beggar, but the key to the collapse of the entire imperial power. And her silent mechanical girl Su Li, her shadow brother Bai Jin who pretends to be loyal, and the mad inspector Xing Xiao who was her mentor, are all secretly deducing this conspiracy about human evolution - what she is repairing is not a machine, but a crack in fate.
