Responses
No he actually did cut his nails, I remember that scene, it was after he made his proposal to nok telling him he has 3 days to think about spending intimate times together every 3 days, because they both needed each other to balance their needs, nok to be safe from the ghosts and jae shin to feed on his energy, and after 3 days when he was headed to nok, he filed his nails across the wall, to cut them. Since nok mentioned that his nails hurt him. So bro cut them :)
BRO JAESHIN CUT HIS NAILS ON ONE HAND SO HE WOULDNT HURT HIM I AM SCREAMING