it's not in their interest to help dohyun though. their whole problem with what sungho is doing is not that it's morally wrong, but just that sungho is taking unnecessary risks and if he gets caught then they are all screwed because sungho knows all about their criminal operations. they are trying to shore up the weakest link in their little mafia or whatever the hell they work in, not mount a rescue mission.
in fact, it would make the most sense to kill dohyun because he's such a risk. if he does by some slim chance escape, he's seen all three of their faces and even heard their names and can tell the police.
I'm just pissed those two dudes didn't help...
The guy was knocked out, clearly a mental case who needed to be locked up, they had a weapon and the door was open.
Even if the taller dude was a douche, morally the other guy was obligated to help. Overall
IM PISSED (╯°Д °)╯╧╧