Byeoljeongjik Gongmuwon

Socially-awkward Ma-Ru Han bombs his fifth attempt at getting a dream job in the civil service. But after a strange creature attacks him in the mountains, he finds himself recruited into the Special Civil Service for the Ministry of Environment. This secret organization is dedicated to fighting nachal, human-devouring demons who appear in clouds of yellow dust. As Ma-Ru struggles in his new job fighting nachal, he must find out why they're mysteriously drawn to him before the prophesied end of the world arrives.

(Source: WEBTOON, edited)