A blacksmith's son should not hold a sword, and treachery is etched in the blood of an illegitimate son.
They met at a crossroads, one carrying an ancestral sword and the other carrying a loyalty that had nowhere to put it.
Winterfell is not the end, and the Twins are not the way home.
When the king's blood dyed the floor of Frey's house red, and when the flag of the North fell in the fire - a blacksmith and an illegitimate son became the last bones of the North.
"The essence of iron does not change. The same goes for people."
——
Purpose: Use "iron" as a metaphor for people to show the spirit of the North that ordinary people are forged by fate in troubled times but always stick to their essence and commitment.