Dragon-Slaying Hero, but This Is the Dragon Clan?

Gu Qing, who traveled to the dragon world, became a dragon-slaying martial artist. Every time he runs, his legs become more sharp as whips, every time he does push-ups, his muscles become more hard as stone, and every time he performs martial arts, his skills become more precise as a photolithography machine, but his fists can never break an entire mountain! He hates it! He must bathe in dragon blood! Dragon-slaying warriors bathed in dragon blood can transcend life levels and gain unparalleled power. Just as he wanted, everyone in Kassel Academy had dragon blood in their bodies. The killing star comes to the world.