Yin and Yang Seam

Yin stitcher: A secret craft that has been passed down for thousands of years, specializing in sewing the "seams" where the yin and yang between heaven and earth leak out. Everything in the world has seams - living people have them, dead people have them, houses have them, cemeteries have them, mountains and rivers have them. Some things that do not belong to the human world will seep out of the cracks-yin energy, resentment, death energy, and more terrifying things. The sewer's duty is to mend these seams with needles and threads. Sewing something: you have to bear the pain of that thing. The more stitches there are: the more resentment accumulated in the soul, the less human it becomes. Every stitch consumes energy, and every stitch changes the soul. The people who sew the Yin will eventually become a half-human, half-ghost existence.