in between the time that jinu left for the palace and the time that the first hunters appeared, something happened in the lives of jinu's mother and sister. an old man, injured and freezing cold, appeared at their door one night in the midst of a terrible thunderstorm. he asked for shelter and food and jinu's mother invited him in without hesitation. she didn't have much, but she shared what little she had with him and tended to his injuries. the biggest thing that she was able to offer him was the fire and a roof for the night.
the next morning, he revealed that he was one of the mountain gods. he offered her a reward for her kindness and for sharing the very little that she had. she asked for protection for her son, who was in the emperor's palace. the god was so impressed with her putting someone else, especially family, in front of her own well being that he granted her this boon. he would send two spirits to protect, guide, and comfort jinu for as long as he needed it. he also granted her another boon: good fortune for herself and her daughter.
derpy and sussie followed jinu until g.wi-ma pulled him into the underworld. once jinu became a demon, he was able to see and communicate with derpy and sussie. they have remained constant companions and comfort for jinu ever since.