Wow, this thread has taken a fascinating turn!
When I was visiting a friend in Korea last year, we were on our way to the mountains when he got into a minor accident with a bongo truck. Although it wasn't completely his fault, we didn't have the language skills to express this when the police and insurance folks came, and the truck driver just steamrolled us because we had no idea what he was telling them and had no way to refute his claims. We were only allowed to go on our way once my friend kowtowed to the other driver in apology, as we were told that's just how you resolve this sort of situation. I'm not sure whatever became of the insurance claim... I'm assuming the apology amounted to an admission of responsibility, so it probably counted against him, I'll have to ask him next time we talk.
@ginlane, even if this accident was completely fabricated, it might be a blessing in disguise that it happened when and how it did, as it's brought to light your friend's shady business. There's nothing stopping this kind of situation from happening again, and if you are found to be working without a visa or the proper license, for an unlicensed business, you and your friends may face much harsher repercussions. They might be good friends and
think they are doing everything aboveboard, but that doesn't make it so. The fact that they want you to work for them without sponsoring a proper visa is a huge red flag, and also indicates that maybe they are
unable to sponsor you because they aren't obeying the law. If I were you, I would find a way to extricate myself from this situation as delicately as possible, and consider it a cheap lesson. Whether or not their intentions are pure, if you stick around with these people they could land you in a lot more trouble.