Iron is the Hunter Kim Chul. He was with Jinwoo in the snowy red gate when they fought against the ice elfs. Kim Chul tried to kill Jinwoo bc he felt enraged after his group of people died in the snow area while Jinwoo's group had warm clothes, food, etc. Igris then killed Kim Chul. Jinwoo knew he couldn't defeat the ice elf by himself so he did the 'ARISE' on Kim Chul and named him Iron