I'm looking for the name of a novel that travels through another world. The male lead is very strong.

When he was in middle school, the novel started with the male protagonist taking revenge by skinning the enemy couple. Later on, when he crossed over to another world, he brought along a very hard piece of iron to be used as a weapon. He couldn't remember some of the plot in between. He only remembered that he met a certain necromancer later on and helped the necromancer learn light magic. The male protagonist's murderous aura was very strong, and he could scare away the monsters in an instant. The characters in the novel complained that he had the might of a dragon. The female lead seems to be an elf