I didn't understand even one word of this premise... 🤣

Sorry, probably too many sleepless nights.

The Devil (Kim Byung-Chul) likes to make Deals for Human Souls so his Hellscape is filled with regretful, desperate, tortured people. However, God (Ha Do-Kwon as an Elvis impersonator) demands that all contracts be in writing and “fair” (at times a bone of contention for contract challengers). Every contract has compensation to the Devil at the end of its term but it cannot be eternal damnation. Death (Kim Kap-Soo) negotiates the contracts and the Prosecutor (Jo Yeo Jeong) takes the cases to trial before the arbitrator, Archangel Gabriel (Jung Woo-Sung) who gets crabby about these “dead end” cases that take time away from greeting people at the Pearly Gates. If a person who challenges their contract and loses, he is sentenced to eternal damnation at the discretion of the Devil, who can be merciless in his ironic punishments.

Meong Cheong-han (Lee Kwang soo) has been mercilessly pestered by his family about having no ambition, drive or intellect to have a normal life. He tries to show them up by taking the bar exam, over and over again. His mother (Yoon Mi-Ra) continually berates Cheong-han that he is “just like that loser in LIVE YOUR OWN LIFE, but uglier.” Death approaches Cheong-han at his darkest hour with a proposition: I will make you a successful lawyer in exchange for your soul. He agrees. On the day of the bar exam results, Cheong-han chokes to death from laughter after seeing his name on the Bar passers list. As his spirit is standing over his lifeless body, Death taps him on the shoulder to say “Sorry, but we are a little short handed in Hell.” Cheong-han objects since he has had no time to gloat to his Mother about his lifetime accomplishment but he immediately materializes in a musty medieval library. “What is this awful smell?” he snorts. The Law Clerk (Yoo Hae Jin) tells him it is the “the stench of wasted lives.” Cheong-han asks him how he can get out of here, the Clerk laughs so hard he chokes and “dies.” Death arrives and kicks Clerk’s side and he is revived . . . “damn contract” he mutters as he gets to his feet.

The Clerk piles case files in the arms of Cheong-han and pushes him into the Office. There he meets the Prosecutor. She snaps at him to bow at his superior, but when he continues to bow lower and lower to her level he “Heimlichs” his last meal (stinky tofu soup) all over her head. He then collapses and “dies” (since one’s last meal has to last forever in the underworld). When Death arrives the Prosecutor argues with him about the quality of help he is giving her. Death kicks Cheong-han in the side to revive him, but the Prosecutor pushes Death aside to kick him as well.

I see you've been paying attention to the current level of K-drama scenario writing.

I can see Shin Hye Sun as the dead Baekje girl. But I am a bit torn with the new recruit. Since Kwak Dong Yeon was excellent playing a similar role in Gaus Electronics, I vote for him.

I barely understand any of this, but I'd pick Yuna, the 12-year-old lead actress from The Kidnapping Day, as our proto-lawyer. I'd also like to see Chae Jong-hyeop playing against type as the inwardly scheming, twice-her-height minion. Someone's going to have to walk me through the premise again, though.

Kim Dal (Bae Doo Na), is ready for retirement, so goes for her assistant Kim Byeol (Shin Se Kyung). They're already planning their own farewell party, and starting the "final countdown".

What they don't know is that all the newbies at work, that are supposed to be training to take over their position, are there to crash their plans.

But it's even more than that. All those newbies have their own plans.

—Newbie 1 (Yoo Seung Ho): he got kinda angry about having to work even after death.

So he threatened Death saying that he will reveal Death's plan to Kim Dal, unless, after all this mess is over, Death sents him to the VIP Paradise.

There's no VIP Paradise, but Death didn't seem the need to correct him.

—Newbie 2 (Jung So Min): she was Death's first option since she used to be a extremely famous lawyer when she was alive. She had a 99% winning rate.

But well, all of this is Death's plan, and Death's problem. What she (newbie) really wants is to take the position and live for another infinite number of years.

Kim Dal needs to go to sleep.

—Newbie 3 (Kim Min Jae): nakasan. Got there because Death's hubby is his ancestor.

Kim Byeol can't believe that guy is going to replace her someday. She just hopes he gets as overworked as she did.

—Newbie 4 aka. ML (Woo Do Hwan): he just wants to do this job right so people will stop bullying him for having the most embarrassing death in the office.

Death (Kim Hyun Joo): feels bad about tricking the Kims. But she doesn't want to leave her empire in the hands of "kids these days". She's... tradicional.
Death's hubby (Cha Seung Won): "grand-grand-grand-grand-grand-grand nephew, fighting!"

What happens after you die, work as a lawyer and then retire? Where do you go? Is it life after death, life after lawyering while dead, or allowing to be dead in peace without working for a hell of a client? What type of contract work does the devil have? Is it all the contracts to make someone a fabulous musician in exchange for their souls (with Georgia being the jurisdiction of choice)?

I'd cast Seo Yea-ji as the ancient lawyer in hell. I can already her voice keeping demons in their place.

As for the self-chocking bar genius... Mmm tricky one. I first thought of Lee Jae-joon, whose Like Flowers in the Sand character had similar intentions even though he never fully admitted it. But he feels too mature for the role.

I need someone younger, fresher, and with a look of believable incompetence (which will be hiding his true honourable colours). Perhaps Moving's Lee Jung-ha who completely sold the kid struggling to control his superpowers for me or Kwak Dong-yeon who takes great pleasure in playing visibly stupid characters who have unsuspected depth underneath ( and who, no matter what he does, looks like his mental age is permanently stuck at 12 year-old).

I am not here to cast, just to give thumbs up to @mary. "Died choking from laughter" - what an original way to die. Nah, you definitely weren't running out of scenarios or you'd have chosen ToD, or worse still, Cliff of Doom!