Debuff Master Manga

A brief description of the manhwa Debuff Master:

Gamer Han Taesung, a kind of livelihood type, found himself encircled at a precipice.
“I have been watching you for a long time.”
Taesung is confronted by the level 999 hidden NPC Deus!
“Would you like to become the disciple of the hidden NPC Deus?”
“Yes!”
And thus the lessons of the maestro began!
“One blow is enough to defeat enemies; two blows are not cool.” Taesung becomes into someone who can defeat opponents with a single hit.
Everyone is going to become a victim! Take them out in one blow!