Special Civil Servant is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

After failing the Grade Nine civil service exam four times and many twists and turns, Han Maru finally succeeded in becoming a special civil servant under the Ministry of Environment. Goodbye, gosiwon! Goodbye, convenience store lunchboxes! But the joy of passing was short-lived. It turned out to be a life-threatening national secret job?! Along with the yellow dust came the demons, creatures that kill and eat humans. The Grade 9 special civil servant job involved waging war against these demons! Han Maru’s life-threatening civil service career begins.