Became the Favorite of My Favorite

Having grown up as a blacksmith under his father, a master artisan of traditional Korean knives, Yu-eun learns the art of crafting swords. After a traffic accident, he awakens in a martial arts world. Realizing he has transmigrated into Namgung Hyun, the extra younger brother of the protagonist, he resolves, "Since I'm born into a wealthy family, I should live quietly and squander the family fortune." But... "A sword made of Damascus steel? This is iron that can't even be found in modern times because the reserves are depleted!" The soul of a sword enthusiast ignites, and he ends up repairing the protagonist's sword, inadvertently inviting his ultimate favorite into his home... "Young Ma...