My name is Han Jin. At sixteen, I became an unregistered nobody, with a rusty nail of unknown origin driven into my bones.
Some said it was the root of all disaster. I believed them.
Later, I used it to kill my first enemy, and only then did I learn that it could devour power and corrode official seals, allowing an unregistered nobody like me to climb, step by step, to a position where others would kneel and call me a just official.
I kept climbing higher, until at last I discovered that the whole world beneath my feet had rotted to its very roots long ago.
And the rusty nail in my bones was precisely the medicine they feared most.