High Martial: I Get Stronger by Showing Off and Face-Slapping

[Spiritual qi revival, showing off and face-slapping, System, no female lead, alien races, invincible protagonist, feel-good power fantasy] In a parallel world, demons run rampant and otherworldly fiends wreak havoc. The human race grows strong, forging a martial path of ultimate transcendence through untold hardships. A modern youth arrives in this world after stepping in to help someone and activates the Show-Off and Face-Slapping System... Demon Emperor: “This human is strong, but there seems to be something seriously wrong with him!” Demon Emperor: “So you hit people in the face first, huh?” Martial Emperor: “Has this guy been this gutsy since he was a kid?” Ye Wushuang: “Sorry, I'm just used to slapping people.” A passing Big Yellow: “Woof, woof?” System: “So that's what you think showing off and face-slapping means? Fine, fine, let's play it that way, then!” Thanks to Ye Wushuang's brilliant interpretation, he turns the System into a face-slapping System. Before long, one victim after another appears. [This blurb is short and not very good. Dear readers, please check out the story itself.]