After the fall of Jinan, the blacksmith shop became a "designated maintenance point" for the Japanese army.
No one knows that every saber that passes through his hands has hidden cracks; every rifle that he repairs is waiting to be stabbed in the back.
It wasn't until the mute woman brought the symbols and the doctor sent the blueprints that he discovered that this silent war between fire and steel was far bigger than he thought.
Melt copper into the fire and wait for the dragon to sing.