I Only Used One Punch to Penetrate Gao Wu.

[High martial arts++ system+relaxation+single female protagonist] "When the beast wave came, Jiang Nan turned around and ran away. The whole network was furious: "Is this the SSS level talent? Coward! " Three days later, Jiang Nan returned to the city with 999 corpses of the Beast King and said slowly: "On the run for three days, I managed to clear out a wave of wild monsters. Why are you so anxious? " From then on, the slogan of Human Defense Line was changed to—— "Jiang Nan, run! There is a lone Beast King behind you! ""