No his hands and feet have always been like that...but the artists misses it here and there throughout the series, sometimes he hand demon nails on both his hands and feet and sometimes he is only half, like his breed half human and half demon.
The OP is right. That’s why Jae Shin’s nails are cut on one hand. It was a plot point in the earlier chapters, if I’m not mistaken.
Maybe it's they way Nik said he cut his nails. What l'm saying is Jaeshin never cut them. I think it was a error the artists made from time to time, because he depicts Jaeshin with both, long nails on one hand and short nails like a human on the other hand.
Nope he cut them in one hand it was mentioned in earlier chapters, his brothers were talking about it
BRO JAESHIN CUT HIS NAILS ON ONE HAND SO HE WOULDNT HURT HIM I AM SCREAMING