I Am a Blacksmith by Profession, and Slaying Dragons with Technology Is Too Cruel!

A professional killer wakes up and travels to a different world, and then changes his job to the most useless blacksmith profession? The system helps me! Isn't it too much for me, a blacksmith, to make armors, tanks, and fighter jets? As long as you have the blueprints, the aircraft carrier can be built for you! Dragon clan? Dark Night Clan? Human race is weak? Talk about my technology empire!