On the novel at this point he really was assume Anze as a pr*stitue, and beside investigation(of someone stole his data) he was kinda expecting what Anze do after they go inside the apartment.
When this revealed very later on, Anze ask "what if he turn out innocent, and he really trying to seduce him?", his answer was implying he's likely not gonna refuse.
This was rather surprising because so out of his character. The only logical explanation was the arbiter already fascinated by Anze on their very first meeting.
What wrong with people? The ending was fine and the story was well written. What do you mean ending was rushed? There literally not single plot was left behind unexplained. I think people need to realize that "good story" is not equal "happy ending".
Rushed ending and plot holes actually don't have to exist together. There wasn't any plot holes but story still feels rushed, I can't say it's not good but it could be better. 15 episodes nothing major, not even a hint what will happen later, then few episodes till end people start missing, last chapters seems to be weirdly put in the story. Rate of the story if someone reads like me in one go isn't consistent this is probably why most people say it's rushed ending. With consistent development and short story some things could be mentioned earlier to set one peace and well developed narrative
Spoiler from the novel, but it's was on sequel so probably won't be on this mahwa.
Yon Jae was actually born psychopath, or sociopath, or whatever you called it where he lack of emotion and unable to feel empty toward others (this is why he was flabbergasted when Yoohan call him psyco for first time because that kinda bullseye).
His mom was dying of sickness, she know his problem and love him but still, she feel sad and disappointed because he never cry for her. Before died she make him promise to never "kill people" which he agreed (but he twist the meaning "if want to kill, don't do personally").
So he went to Korea for his mom funeral, he was bad mood because until the very end he can't show the sadness his mom wants to see. At first he was meet some random gangster and about to use them for release, but a rabbit stop them and Yon Jae ended fight the rabbit on the bed instead.
Turn out that day was also the day Yohan' mom death. When Yon Jae sees Yohan tear he feel something on the deepest his heart, as like he understands Yohan' sadness and feel empathy towards him...
For anyone who's don't know, the manhwa follow the novel quite faithfully. Some plot look confusing but actually quite important.
The novel actually a trilogy :
Payback
Paid Payback
Payoff
All with different focus each. MC' carrier as an actor and ML' role on the company was major plot development so they cannot just skip over it.
Iirc Apparently that magic stone's value is tens of billions