Her name in Hell is Justitia. Due to a system error, the judge Kang Bit-na ended up in 'Gehenna', the hell for murderers. Unaware of this, Justitia simply branded her and sent her off, but was then ordered by Bael to "enter the body of the one you killed, slay 10 sinners, and send them to Hell." Thus, she entered the body of the judge Kang Bit-na in the human world. She sends sinners to Gehenna by branding their foreheads with a seal-like mark engraved with 'Gehenna' found on the edge of her knife. She has fallen in love with a human named Han Da-on who lives next door. She is the third-in-command in Hell. Her favorite thing is Cola.

A police officer living next door to Kang Bit-na. He is an inspector who is kinder than anyone to victims but sharp as a blade toward perpetrators, never believing a word they say. He is somewhat suspicious of Kang Bit-na. He has handsome, puppy-like cute looks. After his mother died when he was young, Kim So-young was the person who filled that void. He believes his mother's death was his fault.

Her name in Hell is Gremory. She is Kang Bit-na's subordinate and junior. Thanks to her part-time jobs, a kind and gentle way of speaking has become a habit. She always carries a small knife, but because her rank is lower than she'd like, she cannot summon or dismiss her blade like Kang Bit-na does. She constantly hits Gu Man-do for acting like a 'kkondae'. She dislikes Han Da-on.

His name in Hell is Valac. He has the lowest rank among Kang Bit-na and Lee A-rong. He unintentionally acts like a 'kkondae' and is constantly hit and ignored by Lee A-rong. He can change his voice. He is hiding the fact that he attends church from Kang Bit-na and Lee A-rong. He is kinder than he looks, and he wears gloves and glasses when holding a Bible. He gets embarrassed quite often. He uses polite speech and is timid. Kang Bit-na once called him 'soggy sujebi'.

A police officer. She plays a role similar to a team leader. She filled the role of a mother for Han Da-on after his mother died. Even when she was young and Da-on accidentally hit her hand with a stone, causing a scar, she always looked after him. Currently, she and Da-on are like siblings who trade jokes.

The second-in-command in Hell. He is an incredibly powerful figure who can both strip away and grant power to the strong Kang Bit-na. However, there is a large power gap between him and the first-in-command.