Watch: Korean fellow accosts street swindlers targeting tourists

I have no idea what's being said in this video of a Korean "nerd" accosting "swindlers" as they try to scam foreign tourists in Seoul, but it's funny! Not sure I'd do this in Rome, even with a camera crew filming. Part of the "nerd vs. swindlers" angle appears to be that the swindlers are religious cultists: check out this Reddit thread about it.