
Hello, translator here. So far, the reason the boss bailed hasn't been explicitly stated yet. However, these kind of stuff (the boss or members running away with the money, murder, etc.) happens a lot in the kinds of job Sungho, Joseph, and Yongsu were in.
I think it was ch8? Where the author showed how much debt the characters had, and I think it's related to the boss or the job. So I think what happened was, the boss ran away with their money (the one they were supposed to receive, but for some reason hadn't; yet) and they're still in debt (Not sure with Yongsu as he wasn't in that debt according to ch8. Maybe he has some other reasons he needed that money) so Yongsu got pissed and decided to take revenge.
Maybe we'll see what really happened sooner or later.
Maybe I missed something or I totally forgot but when and why did they suddenly join the story? Can anyone explain?