So there are many reviews gushing about this drama. I feel a little meh about it.
The drama delivers what the summary/introduction promises. Just that its almost only that much nothing more. plot-wise.

The world building in this drama was really lacking and left my head scratching.
It seemed really christian cosmos inspired, and what bothered me that they seemed to be using legit demon/-ve christian cosmos characters (idk really cause im not christian). I feal that they couldve made the names up for the 'aesthetic' that they clearly wanted instead of using actual ones- cause names carry power. And on the other hand they used only one +ve one.
Putting that point aside, many major plot points where left unanswered.

The show really showcases vigilante justice - tit for tat instead of reform. Large parts of screentime is given to FL just beating up various villains. The gore and blood are supposed to probably elicit a feel good response from the viewer. That made me a uncomfortable- especially since the pain of the survivors ('victims') isnt really the concern- their closure isnt really the concern, but just 'u did wrong so u'll pay for it' is. There arent many emotions involved. Its all very cold. And in this regard- there is a story arc, a character arc. We witness her becoming a feeling demon judge from a cold unfeeling judge from hell. She acknowledges that just beating criminals up and punishing them in the shadows of the night isnt enough to provide justice - closure to grieving families.

The romance in the show gets very little screentime, and is more present just to be a driving force behind her character arc. Her forbidden 'human feelings' for the ML become the reason she starts feeling empathy for aggrieving families and the people around her. All other side characters (including ML) are just present and doing their thing. There isnt much focus on them at all.

You should watch this show if-
1. You like vigilante justice, are ok with skipping forward or watching scenes of criminals just being beaten up, tortured and killed for their crimes.
2. Like wacky FL
3. ML is very smart and persistent. He is so secure that hes fine with dating a demon who's actions are quite often in direct conflict with his job. He's very clear with himself about his ethics system and boundaries.
4. Want to watch a mock- mystery thriller. the only thrilling part was the score. No need to apply brains. Infact it is better if u dont apply brains, otherwise u will notice too many plotholes.
5. The 'action' genre mention refers to the torture scenes ig.
6. Openish HE

Special mention to FL's character- why i watched the show-
I was obviously very unimpressed by the show. It also got really boring past few episodes. But what kept me from dropping it was Kang Bitna's sass. It was very fun and almost inspirational (minus the vigilante justice part). Especially the way PSH smiles/smirks with the score playing in the background, or her boredom and straightforward mannerisms of dealing with everyday boring situations was very endearing and refreshing. Kang Bitna is a 'psycho' , is a little socially challenged, but she is smart, not dull. There is also some comedic effect in the show with its various side characters, mostly in the scenes outside the courtroom and torture.

Special mention regarding 'vigilante justice'-
TBH what's shown in the show isnt really what comes to my mind when i think of vigilante justice - like robin hood. They mostly try to pass on torture as VJ. Criminals who are unrepentant, dont have ability to feel empathy or even comprehend why what they did was wrong, just torturing and morbidly killing them isnt going do anything. I wasnt going to type this out since this is just a show, but unfortunately this is the axial of the show which is baffling. Major screentime is given to these scenes. There remain lot of actual real world questions regarding this particular form of VJ, but be warned that it takes center stage in this show.