Green Skin

Ten years after arriving at a fantasy world, Taeseong loses everything to the betrayal of a fellow human. Reincarnated as a goblin named Gorulz, he is given a chance to seek revenge. Leveling up, gaining the trust and adoration of other goblins, becoming the leader of his own clan, they all serve a single goal: to slaughter the humans he has come to despise.

(Source: WEBTOON)