“I’m from the afterlife.” Lee Do-jin needs money—a lot of it—to cover his younger sibling’s medical bills. With nowhere else to turn, he calls the number on a strange, ominous business card he finds by chance. At the meeting point, he encounters a silver-haired woman shrouded in mystery— a grim reaper, known as a Chasa. She makes him an unbelievable offer: Work as a temp worker for the Underworld. His mission? To stop “Mokdugi,” predators that feast on souls tainted by sin, before they can drag the damned into chaos. Thrust into the supernatural world of death, debt, and spiritual battles, Do-jin must navigate his new double life— balancing his humanity with a job that demands he walk the line between life and death.