The relationships among the characters are also important. In the 'society of the snow original story', they might need to cooperate or compete with each other. For example, some may have different skills and they need to work together to make use of those skills for the group's survival. At the same time, there could be conflicts over limited resources.
No, it's not. 'Society on the Snow' is a fictional creation. The author likely drew inspiration from various sources but didn't base it on actual events.