Goblin Inc.

An ordinary office worker named Manager Oh unexpectedly falls into the demon realm on his way to work and wakes up as a goblin lord on the brink of ruin. To survive, he must plunder and conquer his surroundings. Using his ruthless salary man grit, he sets out to completely overturn
the power balance of the underworld.

Original Webtoon:
Naver Webtoon, Naver Series