I was born frail, with what my grandfather called a pure yin fate, lacking metal among the five elements. I was destined to have no children and spent year after year bedridden.
When I was eighteen, I was on the brink of death. To save me, my grandfather used his own life and my parents' lives as a sacrifice to perform a forbidden yin-borrowing ritual.
I survived, with only my younger sister by my side.
It wasn't until my sister was suddenly kidnapped that I discovered the wife my grandfather had brought into my home to protect my life was not human at all...