Yeah ask Kartein to grow a new arm for him lmaooo, bro still have limits he definitely can't do it, if Kartein says it's not possible then it's not (hopefully you get it lol) although reattachment is a more reasonable request
I'm not too keen for this request, I know Jiwoo treats him as a friend but I don't think they're close enough for that. Aside from Kartein might not agree to it, and I think he's still recovering after healing Kayden.
What if Seo Jiwoo asks Kartein to heal Arthur's arm? >_<