The hairiness of the toe is part of what makes it scary. It's not a normal, clean - looking toe. It's this hairy, unknown thing that gives an icky feeling.
The unknown origin of the hairy toe in the story makes it scary. You don't know where it came from, whether it's from a dead body or some unearthly creature. Also, the fact that it often brings with it a series of unexplained and spooky events like strange noises and apparitions adds to the fear factor. And it creates a sense of dread because the characters in the story don't know how to stop the horror that the hairy toe is causing.
One factor that makes 'bts mama jin fanfic' appealing is the opportunity to explore Jin's role within BTS during MAMA events. Since MAMA is such a big event, there are many possibilities for interesting storylines. Fanfics can show Jin's growth, his relationships with other members, and his influence on the group's success at MAMA. Also, the creativity of the fans who write these fanfics adds to the appeal as they come up with unique scenarios and interpretations of Jin's character.
Since I don't possess such a story of my own, but if we think about it in a general context, a girl might have her first experience with body hair awareness when she notices hair on her legs. She may initially be a bit confused or pressured by the social norms regarding body hair removal. Some may choose to embrace it, while others may start to explore different hair removal methods.
I think it's the idea of something so small and seemingly insignificant like a toe being a source of spookiness. It's unexpected. And when you think about it, a hairy toe in a spooky context, like it being detached and having a life of its own, that's just creepy. It plays on our fear of the abnormal and the unexplained. It's not something you see every day, and our minds tend to fill in the blanks with all sorts of terrifying possibilities.
The grotesque image of a big hairy toe is what makes it scary. It's not something you expect to encounter, and it's a bit repulsive. Plus, the idea that it's related to a ghost means there are unknown and spooky forces at work.