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.