is t "worth it"? dpends on your idea of worth it.
I did this a while ago, and in the end it paid for my vacation and gave me an extra 1.5 million won or so,
BUt I was working 10 - 6 for 6 days a week for 3 weeks ( or 4 weeks, I cant remember which)
For me that was worth it as I didnt have to sit on my butt all day while my wife visited her family, and It didnt end up costing us anything to fly.
If the goal is to get him here, still be able to hang out and not lose money then yes its worth it.