The Demon in the Painting

The female lead is human in body, a demon in soul, and the tears of a Buddha.

The male lead is a young wandering swordsman who slays demons and vanquishes evil.

After meeting, the two grow closer as they fight demons and vanquish evil, and eventually fall in love.

When the female lead's mysterious origins are revealed and the beloved she shared a past life with comes searching for her from thousands of miles away, what will she choose?