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In the underworld, all spirits must undergo seven trials within 49 days of death—taking place in the Halls of Murder, Laziness, Deception, Injustice, Betrayal, Violence, and Family Bonds. Only those who are declared innocent after all seven trials have the chance for rebirth. Firefighter Kim Ji-hong sacrificed his life while saving a girl in a fire. Hell messengers Jeo Yeon-pal and Deok-chun appeared before Kim Ji-hong. Despite his disbelief in his own death, Deok-chun solemnly informed him that he is both a spirit and a noble soul. At the entrance to the underworld, Kim Ji-hong met another messenger, Gang-lim, who was waiting for him at theFirst Military Gate (Chu-Gun-Mun). Gang-lim oversees Jeo Yeon-pal and Deok-chun, and will also defend Kim Ji-hong during the seven trials he is about to face. It turns out that if King Yama allows 49 spirits to be reborn within 1,000 years, the three messengers can also be reborn into the mortal world. They believe that the 48th spirit—the noble soul Kim Ji-hong who has appeared after 19 years—can successfully be reborn. However, as Kim Ji-hong travels through the various hells, his past begins to resurface one after another, revealing that even this noble soul still has "secrets that cannot be spoken."