In the Deep Snow

When the boy who came to slay a god rescued her from the stake on his way past, Xiao Yu fell in love with him.

Even though she and he were worlds apart.

Even though he didn't love her.

Happy ending

[I'm not very satisfied with the blurb or title, and may revise them, but the premise won't change.]

Theme: No matter how far the one you love is separated from you by mountains and seas, even mountains and seas can be crossed.