Demon-Slaying Blade

Su Ji traveled to a world where humans and demons coexisted, and was seduced into stealing a knife. I thought it was a magic sword, but it couldn't kill anyone? He unknowingly embarked on the path of slaying demons, After experiencing various magical events, I discovered that this knife turned out to be... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.