Dokkaebiui Bam

Until just a few days ago, Si-U Choi was your typical high school student. But suddenly he finds out he’s a descendant of the goblin clan, and thus a half-demon. In a dark realm of another world there lives the Demon King, the demon who rules over the night and reigns over all demons of the world. Now, the fight for the throne begins.

(Source: WEBTOONS, edited)