Most hunters in Solo Leveling are looking for different ways to get stronger, either by purchasing expensive equipment and weapons like Yoo Jin-Ho or by collecting runestones like Sung Jin-Woo. Between these options, Sung Jin-Woo would prefer using a runestone to wearing a fancy, yet heavy piece of armor like Jin-Ho in combat. Understandably, runestones work like wonders, especially for hunters like Jin-Woo, who keep growing stronger.