Game of Thrones: Reborn as a Frey

A Fic in which a man from Earth world finds himself in Westros reborn in a family that was destined to doom themselves. How will he live in this cutthroat world? Well, at least he went in with the mentality to survive. (SI isn't a heroic person and he won't do something that will risk himself for some people that in his eyes used to be characters from a book&TV show)