Comment by Rawr I'm Ferocious on Can We Become a Family? - Chapter 1

Hello fellow manwha readers! Needing help trying to remember the name of something I remember reading, but can't recall the title at all... 

Female lead returns to the past in her childhood, she has an insane amount of holy power and it starts off with her in a temple. But she wants to escape knowing that in the next few weeks something happens (can't remember if it was an adoption, being declared saintess, or something else) that leads to her death later in life basically. Temple is nothing but crooks, btw. So cue running away to the north where there's a duke ruling over his icy land... she arrives in rags and being skin and bones because of how the temple treats the children there.. she makes it, and the duke betrothes her to his son cause her powers seem useful but son hates her at the start... 

Amy help would be much appreciated! It may be a web novel instead of manwha, but am unsure