We first saw these in February, and this time they have gone up in multiple locations around Suncheon. This one was taken across the street from NC Outlet and the apartment complex where many native speaker English teachers are housed. The banner reads:
Intensive Control Period of Foreigners' Illegal Extracurricular Work For Forced Repatriation
[원어민 불법 과외 적발시 본국 강제소환 집중단속기간]
As you can see the phone numbers on the bottom are for the Yeosu Immigration Office, the Suncheon Office of Education, and the Suncheon Hakwon Association. It goes without saying that you should always be wary of strangers approaching you to teach private lessons, as they not only lead to headaches but also violate the terms of our E-2 visas and can thus lead to deportation. While many Koreans don't seem to know it's illegal, there's always the possibility that the person asking you is hoping to trick you and cash in.