Following his heroic death, firefighter Kim Ja-hong finds himself in the afterlife, accompanied by three guardians, Gang-rim, Hae-won Maek, and Deok-choon. His guardians inform him that he must undergo seven trials over 49 days to prove he lived a noble and selfless life on Earth to be reincarnated. Each tribunal judges a different virtue, and they traverse through various hells to present evidence of his righteousness and confront accusations of sins he may have committed during his lifetime.

As they navigate these trials, the guardians uncover details about Ja-hong's past, revealing secrets and regrets he harbors. Along the journey, they encounter vengeful spirits and deities who challenge their mission, making it increasingly difficult to achieve their goal. The guardians themselves also contend with their own histories and moral complexities, contributing to an emotional and arduous quest for redemption and closure.