He was once the only gold medal killer in the world whose sword was worth a thousand pieces of gold.
She was once a generation of medical fairy who passed through the world gracefully and whose clothes were not stained by dust.
Their legends are still circulating in the world, but they have already left the world.
What makes two people separated by worlds meet and fall in love?
What is it that prevents two people who will stay together until death do us part?
Why did she leave him?
Why did he let go?
And what made her so cruel that she felt like a stranger to the person she loved?
What made him finally find her and leave her silently?
Their feelings, their love, and their legends are all in the abyss of the other side...