Kim Jinhyuk has only one goal: finish his shift, collect his paycheck, and go home.

Unfortunately, that's difficult when you're the former Number Zero—the legendary assassin who once terrified the underworld.

Working part-time at an ordinary magic shop should have been the perfect hiding place. Instead, every guild attack, terrorist plot, and monster incident somehow ends with the trouble quietly disappearing after closing time. As rumors spread, his coworkers invent increasingly absurd explanations for his mysterious behavior, while hunters across the country become fascinated by the strangely harmless young man who always seems to be standing where impossible miracles happen.